how long does the free form last?

It's forever free. But we have a limit for free accounts. Free accounts can only receive up to 100 submissions per month and 100MB of file storage. If you'll reach this limit, your forms will be temporarily disabled until the next monthly reset or until you will upgrade your account to our next plan which is a paid one.

Check our pricing page for comparison: https://www.jotform.com/pricing.