Discussion has a shelf life. Past a certain point people are not weighing options, they are agreeing to whatever will let the room disperse, and decisions made in that condition are the ones revisited a fortnight later. Running long feels like thoroughness and often produces the opposite, since the final twenty minutes can overwrite what the good part achieved.

Set an end time and treat it as real. If the decision is not ready when the hour is up, name what is missing and stop, rather than pushing on through the last of everyone’s concentration.