Originally Posted by landarc
If you want to pull it at 6pm, start it at 4:45pm, smoke at 225F until 5:45pm, then sear and rest, you will be serving by 6:15 at the latest.
My tri tips are usually 45 min but I often indirect cook between 250 and 275 instead of 225. If you plan to reverse sear, you can always let the tri tip rest a little more than it needs before you sear it to final temp, just to stretch time.
This has been posted before so may be old news, but great carving vid here: