How many times can I renew my pre-approval?

Credit reports are good for90 days and your income/asset documents are good for 30 days. You would you To send your lender updated documents to have the PreQualification updated.

Generally I simply tell people that yes, technically pre-approvals can expire, but as long as nothing has changed, assume you are fine. We don't necessarily need to keep pulling credit or getting documents until you are serious about an offer, and it has been a long time, I would probably ask for updated documents.

depends on the lender ..so ask your lender ....should be a matter of providing updated bank statements / paystubs and having new credit pulled every 3 months if needed