Comment by crazygringo

A day is crazy. In my experience, retrospective takes about 30-60 minutes, and estimation is usually 1.5-2 hours.

Does it take time? Sure. But what's the alternative? Not doing it is even worse, because you wind up with these endless never-finished "features" that turn out to be 20x harder than anyone thought, that engineers have sunk months and months and months into...