Survey Length Estimator
Estimate how long your survey will take to complete based on question types and counts. Plan surveys that respect respondent time and minimize drop-off.
Question Counts
Estimated Completion Time
Add questions to see estimated completion time
Built by Lensym — focused on valid, reliable survey research.
Understanding Survey Length
Survey length directly affects response rates and data quality. Longer surveys see higher drop-off rates and may produce lower-quality responses from fatigued respondents.
How We Estimate
Time estimates are based on research on survey completion behavior, including Cape (2010) and industry benchmarks. Different question types require different cognitive effort:
- Closed questions (multiple choice, rating scales): 8–12 seconds
- Matrix questions: ~6 seconds per row
- Open-ended questions: 30–75+ seconds depending on expected length
Why We Show a Range
Completion times vary significantly between respondents. Fast respondents may complete in 70% of the average time; slower respondents may take 150% as long. The range reflects this natural variance.
Optimal Survey Length
Research suggests diminishing returns on data quality beyond ~10–15 minutes. For general population surveys without incentives, aim for under 7 minutes. For captive audiences (employees, customers with relationships), longer surveys may be acceptable.
What This Estimate Does NOT Account For
- Question complexity — A 10-option multiple choice takes longer than a 3-option one
- Skip logic — Branching can significantly reduce actual completion time
- Device type — Mobile respondents typically take 20–30% longer
- Introduction and closing pages — Add ~30 seconds for survey context
For a deeper discussion of survey length and fatigue, see our guide on how long should your survey really be.