limit of the survey

You can collect up to 50 responses at a time in the Free account.  You can also export and delete responses so you can continue to collect more.

See this FAQ about collecting more responses in the Plus account, the same applies to the Free account except that Free only allows 50: http://forums.adobe.com/docs/DOC-1382

This FAQ describes how to export responses: http://forums.adobe.com/docs/DOC-1383

Thanks,

Josh