Depends on the airplane and the operator...
Our 747 manuals tell us reverse as needed down to 80 KIAS, idle reverse by 60 KIAS, out of reverse by taxi speed. 60 KIAS is also our max for using a "high speed" exit taxiway, and 20 knots ground speed for normal taxi. So, out of reverse by 60 or 20 knots, depending on the situation...