The Stopwatch Test: Spotting a Fair UK Interview Task Before It Eats Your Weekend

Take-home tasks have become the awkward third round of UK hiring. You get through the screening call, survive the competency questions, then a PDF lands in your inbox asking you to 'put together a short piece of work'. Sometimes it is short. Sometimes it quietly turns into a weekend takeover.

The 90-minute rule will not settle every argument, but it gives you a clean way to tell the difference between a fair skills check and a project that belongs in someone's paid diary.

The 90-minute rule, in plain English

The rule is simple: if you cannot read the brief, ask any clarifying questions and produce a sensible first version within 90 minutes, treat the task as a project, not a test. Time yourself. A legitimate exercise usually asks for one thing done well: a short written answer, a small data exercise, a sample email, a mini-presentation outline. It has a clear output, a clear audience and a clear limit.

If the brief needs a glossary, a kick-off call and three browser tabs just to understand what is due, the clock has already told you something. The 90-minute rule is not a legal threshold and it is not a personality test. It is a scoping tool. It helps you say, calmly and professionally, that the task has grown beyond a reasonable interview exercise.

Four signs the task has quietly become a project

First, the brief is vague in a way that suits the employer. Phrases like 'show us how you would approach this' sound open and creative, but they can also mean there is no agreed scope, no word count and no clear audience. A fair task gives you enough constraints to do yourself justice.

Second, you are handed live client data or real customer information. A skills check can use a sample, a fictional scenario or anonymised material. If you are being asked to work on actual commercial information before you have a contract, that is a prompt to ask questions.

Third, the language shifts from 'test' to 'deliverable'. Watch for requests to 'just polish it off', 'make it client-ready' or 'treat it like a real brief'. Those words matter. They turn an exercise into unpaid work.

Fourth, the scope grows after you ask questions. You query one point and suddenly there is an appendix, a slide deck and a set of recommendations. That is task inflation. A genuine interview task should survive a clarification question without doubling in size.

Scripts for pushing back without sounding difficult

You do not need to send a lecture on employment law. You need a short, friendly message that sets a boundary and keeps the conversation moving.

• Clarify the time budget: 'I am keen to do this properly. Can you confirm the expected time commitment? I am planning around 90 minutes so I focus on the right parts.'
• Offer a time-boxed version: 'I can deliver a focused version covering X and Y within 90 minutes. If you need the full Z as well, could we talk about timing or whether that stage is paid?'
• Ask for anonymised material: 'I would rather not handle live client data at this stage. Could you send an anonymised sample or a fictional brief?'
• Reset an unreasonable deadline: 'I cannot do the full task justice by Monday, but I can send a structured outline by then and the finished version by Wednesday. Would that work?'
• Name the bigger scope: 'This looks like a bigger piece of work than a standard interview task. Is there a budget for it, or shall we agree a smaller scope?'

Keep the tone collaborative. You are not accusing anyone of anything. You are scoping a piece of work, which is exactly what a good hiring manager should expect from a candidate.

When to walk away, or ask for payment

If the task would take a day, uses real client material or produces something the business could use tomorrow, ask whether it is paid. A good employer will either narrow the brief, offer payment or accept a smaller sample. A bad one will get defensive. That is useful information too.

You can decline politely: 'Thanks for sending this over. I am not able to take on an unpaid project of this size, but I would be happy to do a 90-minute exercise or talk through my approach in an interview.' In the UK, short unpaid work trials can form part of recruitment in limited circumstances, but they should be genuinely short and about assessing you, not about getting free work. If something feels off, ask. If the answer is still off, protect your time.

Turn a fair task into an interview talking point

If the task passes the stopwatch test, treat it as a live audition. Keep a one-page decision log: your assumptions, the trade-offs you made and what you would do with more time. In the debrief, use a two-minute structure: what I understood, what I did, why I did it and what I would change. That turns a take-home exercise into evidence of how you think.

Ask for feedback even if you do not get the role. And do not hide the fact that you managed the task carefully. Saying 'I focused on the two highest-impact areas and noted what was out of scope' sounds far stronger than delivering a rushed twenty-page document nobody asked for.

The bottom line

The 90-minute rule is a prompt, not a law. Some fair tasks take two hours. Some one-hour tasks are still unpaid consultancy. But the clock gives you a clean way to start the conversation. Your time is part of the package. Treat it that way, and the right employer will respect you for it.