Do not book more meeting time than is needed

Email and scheduling applications have a habit of allocating a minimum time (15 mins, 30 mins) for a meeting. This creates a 'standard' meeting size that could anchor how the meeting is conducted. A five minute conversation could extend outwards to fill the space, requiring more contribution from participants than was truly necessary,

That said, the extra time could be used to Buffer meetings with breathing space, so there are benefits to this approach too - but that requires explicit buy-in from all participants.