Can only Public apps be graduated to Production ? How long do they take for graduation ? Please guide through the process , my app is currently in Sandbox environment
Public and private are both qualified for graduation. It depends on how you pass the graduation criteria based on the API calls and the permission endpoint.
Go through a great documentation here given step by step with explanation and made it simple.
Also, the criteria is explained here very well : https://forums.developers.ringcentral.com/questions/911/5-api-calls-per-each-used-endpoint-20-in-total-sns.html