You set the deadline, so the real question is what timeframe actually helps you. In California, the standard purchase contract defaults to a three-day window for the seller to respond if you don't specify otherwise, and either side can shorten it (asking for a same-day or 24-hour answer, for example). Contract forms vary by state, so confirm what your local agreement uses. Our guidance: keep the deadline reasonable and tied to your real intent. A short fuse can be a useful signal when you have leverage, but it works against you if you set an aggressive deadline and then don't honor it, because backing off your own stated line makes your position look softer. Sellers also sometimes need legitimate time (a married couple deciding together, for instance), so an unreasonably tight clock can just irritate the other side without gaining you anything. How much weight a deadline carries depends on conditions. When a listing is drawing many competing offers, a seller has little reason to engage with a below-list offer on a tight timeline. When demand is softer and buyers have more room, the same tactic carries more force. Set a deadline you're genuinely prepared to act on, give the seller enough time to say yes, and lean on the pressure only when the market gives you the standing to use it.