Customizing Auto-Save Behavior
The Forms application automatically saves the form creation progress as you create a form. By default, a form’s draft is auto-saved every minute.
To change the duration:
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Navigate to the Control Panel → Configuration → System Settings. 
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Under Content and Data, click Forms. 
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On the left menu, click Forms under Site Scope.  
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Enter a different Autosave Interval value to increase the interval. To disable Autosave, enter 0. 
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Click Save.