Plan a brisket smoke by weight — with the target internal temp, smoker temp, and an honest warning about the stall.
A 14 lb brisket at 225°F runs roughly 17–21 hours, but expect a stall around 150–170°F that can add hours. Pull it at 200–205°F when it probes tender — not at any particular time.
Smoking is the method where the clock lies most: weather, smoker swings, and the stall all move the finish line. The time above is for planning your day — cook to the target internal temperature with a probe thermometer, and pull when it's probe-tender.
Smoking a different cut? Use the full smoking time calculator.