Whenever we put in an offer on a property, we include a time frame for acceptance or a counter. For us, this is usually 48 hrs., the date and time from when the offer is made is actually stipulated. For example, the offer is written on Jan. 1, 2017 at 2:00 p.m., the seller has until Jan. 3, 2017 at 2:00 p.m. to respond. If no response, the offer is null and void, and the potential buyer is free to pursue other properties. If a buyer doesn't put in a stop date, it is difficult to move on, as the seller can sign an acceptance after a lengthy time and the buyer is potentially on the hook for that property. Always put in a stop date! The length of time you want to wait is up to you, but put one in.