FHA Mortgage

I was wondering if anyone could direct me to the area/site I would need to research to find / or provide the number of days that would go into page 4, number 9(e) on an FHA Mortgage below:
"Borrower agress that if this Security Instrument and the Note are not determined to be eligible for insurance under the National Housing Act within__________days from the date hereof"

Thanks a bunch!

Our FHA mortgages have 60 days

Thanks Sox...in fact I found a model which states that the paragraph itself is optional, but if the lender chooses to use it the dates would be a minimum of 60 days and no more than 8 months. Thanks for the help!