Question on financing a multi-family with FHA

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When purchasing a 3-4 unit multi-family, you need to live in one of the units to secure financing through FHA. My question is WHEN do you need to start living there after you close on the property? If all the tenants are currently under lease, can you wait until one of the leases are up? If I am currently renting somewhere else, can I wait until MY lease is up? What is the time-frame for this?