We are creating a survey we will be sending out and it is very possible we may have around 40,000 contact to send this survey to. Do we have any limits in terms of how many people we can include on a survey and for this amount of contacts to send to, is there anything special we need to do?
SurveyGizmo does not impose any response limits (per survey or otherwise) on paid accounts. If you have a Free Account, the limit is 100 responses per survey.
Depending on whether you are intending on the sending out your survey via a SurveyGizmo Email Campaign, you may run into the limits described here:
I hope this helps clarify!