Does anyone know the limit on the number of tokens LimeSurvey can import at once? I have a large survey where we will be doing 50,000 at a time, and I have import errors when I cut that in half (25,000 at a time). 100 at a time works.

What is the limit here?

I don't think the problem is the number of tokens, but the file size. This would depend very much on your server settings. What is the error message?

Thanks for the reply - I found the problem a short while after posting this (though I'd already been at it for a couple of hours).

I was getting a "limesurvey upload file not found" error, and it told me to check my permissions on the limesurvey/tmp/upload directory, but those weren't the issue.

My upload_max_filesize setting in PHP was the culprit - it was set to 2M. Adjusting this did the trick and let me run the large file.

Part of the confusion here also involved IIS, since our site runs on IIS - there is a setting there (maxRequestLength in the <httpRuntime> element) which has a default limit of 4M for file upload size. But it turned out PHP was the limiting factor here.

Thanks for the feedback. It is important to post the solution, even if you find it yourself as this might help others.