Survey Length & Completion Time Estimator
Predict how long a survey will take to complete from its question mix.
How the survey length estimate works
This calculator estimates how long a survey will take respondents to complete, using commonly cited rule-of-thumb response times: roughly 8 seconds for a closed-ended question (multiple choice, rating scale) and roughly 30 seconds for an open-ended question that requires typing.
Enter how many closed-ended and open-ended questions your survey has. The calculator returns the estimated total time, and flags surveys estimated to run past 10 minutes — a commonly cited point past which response quality and completion rates tend to decline.
This is a planning estimate, not a measurement — actual completion time depends heavily on question complexity, device (mobile vs desktop), and respondent engagement. Pilot test with real respondents whenever the estimate is close to your time budget.
The formula
Estimated time = (Closed questions × 8s) + (Open questions × 30s)
Multiply the closed-ended question count by 8 seconds and the open-ended question count by 30 seconds, then add the two together for the total estimated completion time.
Worked example
20 closed-ended and 5 open-ended questions
(20 × 8s) + (5 × 30s) = 160s + 150s = 310 seconds, about 5.2 minutes.
Frequently asked questions
Why 8 seconds and 30 seconds specifically?
These are commonly cited industry rules of thumb for simple closed and open questions respectively. Complex questions, long answer lists, or matrix grids can take meaningfully longer — treat the estimate as a starting point, not a guarantee.
Why does the calculator flag surveys over 10 minutes?
Ten minutes is a widely cited threshold past which respondent fatigue commonly increases drop-off and lowers data quality. It's a caution flag for survey design review, not a hard rule for every audience or topic.
Does this account for skip logic?
No — it assumes every respondent sees every question you enter. If your survey uses heavy branching, estimate based on a typical respondent's actual path rather than the full questionnaire.
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