The thirty-minute lunch is one of the quiet defeats of modern work: long enough to eat, too short for anything to happen. Research on creative collaboration keeps finding the same shape — trust forms in unstructured time, and unstructured time cannot be scheduled in half-hour units.

The three-hour lunch is not indulgence; it is a different tool entirely. Hour one is the meeting you would have had anyway. Hour two is where someone risks an unfinished thought. Hour three is where the thing you will still be working on next year gets its first sentence.

You cannot do this weekly and should not try. Do it monthly, with people slightly outside your field, and protect it the way you would protect any other piece of serious equipment.