Refi's - how long to wait?

[KJ D'Costa]

I'm contemplating a buy, rehab and hold strategy for multifamilies (2-4), using private or hard money for purchase, cash for reno, then refi-ing and repeating the process. But I'm read several different rules about when you refi a rehab property - only with tenants, after six months, after 12 months. It's critical that I know how long I have to maintain the original financing before I can refi. So what's the actual rule?

Thanks!