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Aditya RautAditya Raut 

can we reduce the refresh interval limit of Partial sandbox? or Increase the refresh interval of Developer pro sandbox?

SwethaSwetha (Salesforce Developers) 
HI Aditya,
As per https://developer.salesforce.com/forums/?id=9062I000000R0iJQAS you can reach out to Salesforce support with if you have a valid business scenario to have the refresh limit reduced/increased.

If this information helps, please mark the answer as best. Thank you