Following a covered fire loss under an Illinois homeowners policy, within how many days must the insured submit a signed, sworn proof of loss to the insurer absent an extension?

Why this is the answer

The Illinois Standard Fire Policy provisions at 215 ILCS 5/397 require the insured to render a signed and sworn proof of loss within 60 days after the loss, unless the insurer extends the time in writing. The proof of loss must include the time and origin of the loss, the insured's interest, encumbrances, other contracts of insurance, and changes in title, use, or occupancy. Failure to file timely may bar recovery absent waiver.