Refi on High Appraisal off of Purchase

[Shri Ganeshram]

I purchased a home using a 2 year lease to purchase contract recently. I purchased it at the negotiated price we set 2 years ago. The appraisal and comps used during the mortgage process show the home being valued at 20-25% more. I'm curious to understand what the process is typically to cash out refi at the appraised value (not the purchase value) and in what time period I'll be able to do so.