3 days. The sooner the better, that would also help the other realtors to know you already accepted an offer and they won’t waste their time showing it.
You start counting the 3 days beginning the day after the executed date on the contract. Every day is counted regardless if it is a holiday or weekend. It MUST be dropped to the seller or the Listing Agent by the 3 day. There is a page with the 1-4 family document for the Listing Agent or the Sellers to sign and date receipt of the option check being delivered. It is NOT to be dropped at the Title Company.
3 days. (Rule 2.5 Reporting Sales to MLS: Sales pending (including Option Pending and Pending Continue to Show) shall be loaded with the MLS within three (3) days...)