Regular meetings and calls can't go over twice a week period. For me, it's one of the biggest reasons for unproductivity. I've worked on a lot of projects and the amount of meetings was directly correlated to how much everything was delayed.

In all cases, the people who pushed the most for meetings were the ones who contributed the least, and in fact had a negative impact. Nowadays it's a nonnegotiable rule from the start in our agency when taking on new clients.