Surveys can be conducted as often as you like. Edkimo does not impose a limit on the number of participants in a survey.
If you want to limit a survey to a certain number of participants, you can use the TAN mode. You can find instructions on how to do this in this Help Center article: Can I limit the number of participants?
If you want to end a survey, move the slider on the survey card to gray/inactive. Then no one can participate in the survey anymore.
This setting can be reversed at any time.