re-occupy rental to refi as owner occupied

[Diem Tran]

Hey guys, I'm stuck in a pickle. I purchased a house under FHA with 3.5% down. Now I want to refinance to a conventional loan so that I am freed up to use another FHA. However, I've already moved out of the house (only 6 mo after purchase due to my dads health problems 60 miles away) and have tenants in there, rentals were filed along with last year's tax returns. Refinancing as an investment property of course means a higher interest rate and larger equity. my idea is to move back into the house, and then refinance as owner-occupied. How long will I have to live there in order to refinance as owner-occupied?