To qualify for FHA, how much of the year must I occupy the reside

[Cady M.]

Im a full time flight attendant and travel with work more than 50% of each month.

Id like to buy a duplex out of state, using an FHA loan, and occupy one of the units for the first year.

I currently rent a room in NYC and would like to keep it for layover purposes, while the new property (in SC) serves as my primary residence.

How often must I be physically present at the duplex, for it to qualify as my primary residence? Will I get accused of mortgage fraud if my job causes me to be away much of the time? 

The eventual goal would be to rent out both units, but I need the FHA to be able to afford the down payment on the property.

 Newbie here! Any and all advice is welcome!