Why answers fail on length, not content
Most rehearsal happens without a clock. You think an answer through, decide it holds up, and move on. In the room the same answer takes four minutes, because thinking is far quicker than speaking — roughly 130 words a minute out loud, against a silent read of well over 200.
An interviewer with a 30-minute slot and ten questions has under three minutes each, including their own follow-ups. A four-minute answer does not simply cost time; it forces them to drop two later questions, and those are often the ones you would have answered best.
Length is also read as a signal. An answer that keeps going suggests someone who cannot tell what matters, whatever the content. Interviewers rarely say so directly — the written feedback usually says communication or structure — so candidates fix the wrong thing and go away to rehearse more detail.
Setting the limit before you start
Decide the limit before you hear the question, not after. Sixty seconds for tell me about yourself. Ninety for motivation or strengths. Two minutes for a behavioural question that needs situation, action and result. Three minutes only for a technical walkthrough where you are expected to reason aloud.
Treat the limit as a target rather than a ceiling to creep up to. Aim to finish at about eighty per cent of it — 48 seconds on a 60-second question — which leaves room for the follow-up you actually want, and follow-ups are where most of the useful conversation happens.
If an answer will not fit in two minutes, the problem is scope, not speaking speed. Pick one incident instead of three, name the result inside the first fifteen seconds, and let the interviewer ask for detail. Trimming words rarely rescues an answer that is trying to cover a whole year.
Reading the review
The review shows the time each answer took against the limit you set. Look at the pattern rather than the total. Overruns cluster on the questions where you have the most experience, because there is more to leave out, and those are the answers that need cutting hardest.
Keep two judgements separate when you score: did it fit, and was it any good. An answer can finish comfortably inside the limit and still say nothing, and merging the two hides which fix is needed. Re-run the ones that failed on time; the ones that fit gain little from repetition.
Three passes over the same eight questions beats one pass over twenty-four. By the third pass you should be finishing early with the same substance, and that is the habit that survives the nerves of a real interview, when everyone speaks longer than they planned.