There is no limit as to how many questions you can create. You are only bounded by the number of votes/responses you have. You can create as many polls as you like given that you have enough responses for your audience to be able to vote, as long as your plan is active. 

Different plans are active for different periods of time. One-time plans are only active for 30days since purchase. Monthly and educational plans are active for 12 months. 

Learn more about plans here.

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