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HomeEconomyIs my online questionnaire too long?

Is my online questionnaire too long?

I sent the questionnaire to an email list provided by the client* and received this email:

Started answering but too long. 

I replied:

Thanks for letting me know.

I sent the email on Monday and the current response rate is 36%. The completion rate is 95% so maybe up to 5% of the respondents think the questionnaire is too long.

Here is the distribution of minutes taken to complete the survey:

The median is 8 minutes and the mean is 10. Six respondents took more than 20 minutes to complete it and one took over an hour (i.e., got started, had dinner, and then finished).