The night before a deadline, everything looks longer.
A paragraph becomes a chapter. A graph becomes a thesis. And your IA becomes a quiet, expanding universe sitting in your Google Drive.
So when students ask, "Which subject has the longest IA?" they're usually asking something more human: Which IA will cost me the most time, energy, and sleep?
This article will answer the question honestly. Not with folklore, but with the structure of IB coursework itself: page limits, what counts as "length," and why some IAs feel endless even when they're capped.
Along the way, you'll also see how RevisionDojo can shrink the chaos: using the Coursework Library to model strong exemplars, Grading tools to check your rubric alignment early, AI Chat when you're stuck, and your usual exam toolkit (Study Notes, Flashcards, Questionbank, Mock Exams, Predicted Papers, Tutors) to stop coursework from hijacking exam season.
The quick answer: "longest IA" depends on what you mean
If you mean longest by official written page limit, then the classic winner is:
- IB Mathematics IA (Math AA or Math AI): typically 12--20 pages depending on what counts (students commonly cite 12--20 as the practical band used by schools and teachers).
If you mean longest by time spent, the answer often shifts:
- Group 4 Sciences IA (Biology, Chemistry, Physics, ESS) can feel longest because data collection, trials, uncertainty, and processing take time.
- Humanities and arts coursework can feel longest because writing, iterating, and evidence selection is slow.
- Computer Science IA can feel endless because debugging doesn't respect your calendar.
So the real answer is: the "longest IA" is the one with the most hidden work.
IA length checklist (use this before you compare subjects)
Before you label a subject as having the longest IA, check these five things:
- Is there a page limit or word limit? (A short limit can still require huge work.)
- How much time is spent before writing begins? (Experiments, code, surveys, drafts.)
- How strict is the evidence requirement? (Tables, graphs, appendices, citations.)
- How many revision cycles are normal? (Teacher feedback loops matter.)
- How easy is it to "know you're done"? (Some tasks have no natural finish line.)
A good strategy is to decide early whether you're optimizing for maximum marks or maximum sanity. RevisionDojo is built to support both.
Which subject has the longest IA by page count?
For most IB students, the Math IA is the clearest "longest IA" in terms of visible pages. It's designed as an exploration, which means you must show:
- a clear aim and rationale
- personal engagement (in the mathematical sense)
- mathematical communication
- correct mathematics and reflection
That structure naturally creates length: you introduce, explain, compute, interpret, and then reflect. Even when you're being concise, math needs space.
If you want to see how high-scoring work is shaped, use RevisionDojo's Coursework Library to browse IA exemplars across subjects, including math explorations and science reports: IB Coursework Exemplars Index (IA, EE, TOK). It's one of the fastest ways to understand what "enough" looks like.
For math-specific inspiration and modeling, these are especially useful:
- IA Examples for IB Math AI
- Using IA/EE Exemplars to Improve Your IB Math IA
- How to Maintain Mathematical Flow and Coherence in the IB Math IA
Which IA feels longest in the sciences?
A science IA is rarely "long" because of pages. It's long because reality fights back.
A Biology, Chemistry, Physics, or ESS IA often includes:
- planning and pilot trials
- controlled variables and method refinement
- messy data that needs cleaning
- uncertainty processing and evaluation
- rewriting the same section because your conclusion doesn't match your aim
Even if your final report is within a relatively tight cap, the process can be huge.
If you're doing ESS, RevisionDojo's grader is a strong reality check early in the draft phase: IB ESS (new) IA Grader. It helps you see which criteria you're under-serving before you add more pages that don't earn marks.
For sciences, the Coursework Library is also your shortcut to sanity. Instead of guessing how much analysis is "enough," you can compare your work to exemplars like:
The goal isn't to copy. It's to calibrate your sense of proportion.
Which IA feels longest in Group 3 and Group 1?
Students often underestimate these because they assume "writing = straightforward." But writing is only straightforward when you already know what you think.
Many Group 3 tasks and language assessments can feel like the longest IA because:
- the evidence selection takes ages
- you can always add "one more source"
- clarity requires rewriting, not just adding
What helps here is not producing more words. It's producing better structure.
RevisionDojo's AI Chat can be surprisingly helpful at the "blank page" stage: ask it to pressure-test your research question, propose an outline aligned to criteria, or suggest what kind of evidence would actually score. Then you can switch back into exam mode revision with Study Notes, Flashcards, and Questionbank practice without letting coursework swallow everything.
If you want a broader "system" for balancing coursework and exams, this piece frames it well: RevisionDojo App: The Smarter Way to Prep for IB Exams.
The hidden champion: the Computer Science IA
If you're in IB Computer Science, you already know why this gets mentioned.
The CS IA is not about pages. It's about building something that works.
Debugging can stretch time in a way that no word count can control. A tiny bug can cost three hours. A feature you thought was "small" becomes a week. And the documentation becomes a second project.
If you want to see what real projects look like at different score bands, use: IB Computer Science IA Exemplars.
The better question: what makes an IA become "too long"?
The IB rarely rewards length. It rewards alignment.
An IA becomes "too long" when:
- You add explanation that doesn't earn criterion marks
- You include data you never interpret
- Your evaluation repeats your conclusion
- Your exploration becomes a diary instead of an argument
This is why the fastest way to shorten an IA is to grade it early.
RevisionDojo's rubric-based Grading tools are built for that moment: when your draft is complete enough to judge, but early enough to change.
Examples:
When you treat the rubric like a checklist, your IA stops expanding.
How to manage the longest IA without losing exam season
Here's a simple plan that works across subjects, especially if your IA is eating your revision time.
Make your IA "small enough to finish"
Pick a question that can be answered in the time you actually have, not the time you wish you had. If you can't describe your method in 5--7 sentences, it's probably too big.
Use RevisionDojo's AI Chat to shrink scope. Ask: "What is the smallest version of this question that still meets the criteria?" Then commit.
Use exemplars to calibrate length
Instead of asking classmates how long their IA is (they will either exaggerate or lie), use exemplars.
Start with the hub: IB Coursework Exemplars Index (IA, EE, TOK). Find 2--3 exemplars near your subject and compare:
- number of graphs
- depth of evaluation
- how concise the introduction is
You'll notice something comforting: top work is often calmer, not longer.
Run a rubric audit before you add pages
Before you write more, check whether you've already met the criteria.
Use RevisionDojo's graders where available (ESS, Psychology, DT, and more). It's like turning on headlights before you keep driving.
Protect your revision loop
Coursework is important, but exams still matter. Keep your baseline exam routine alive:
- Study Notes for fast clarity
- Flashcards for daily recall
- Questionbank for practice under mark-scheme logic
- weekly Mock Exams and Predicted Papers to train timing
If you need a full system, this is a strong framework: Top Students Don't Study Like You Think (IB Edition).
Closing: the longest IA is the one you don't control
So, which subject has the longest IA?
By page count, math usually wins. By total hours, sciences and computer science often take the crown. But in practice, the longest IA is the one that keeps expanding because you're working without a compass.
Give yourself the compass.
Use exemplars to see what "enough" looks like. Use grading tools to catch gaps early. Use AI Chat to unblock decisions quickly. Then return to the exam loop: Study Notes, Flashcards, Questionbank, Mock Exams, Predicted Papers, and Tutors when you need a real human to help you lift the ceiling.
If your IA is taking over your life, don't just write more. Tighten the aim, align to the rubric, and let RevisionDojo carry the heavy structure so you can keep your momentum toward the exams.