Mortgage pre-approval questions (FHA fixed loan)?

1.) Once we get all of our paper work together or go to our bank, about how long before we get an answer on whether or not we are approved? 2.) If we get pre-approved, once we find a house, is that approval only good for getting a mortgage at that bank? And on average how long is a pre-approval good for, not sure... show more 1.) Once we get all of our paper work together or go to our bank, about how long before we get an answer on whether or not we are approved?
2.) If we get pre-approved, once we find a house, is that approval only good for getting a mortgage at that bank? And on average how long is a pre-approval good for, not sure when we might close on a house, so I dont want to get pre-approved in the next few weeks, just to go through it again if we dont find a house right away.
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