I'd like to embellish on Matthew Rechs' 11 Promises as a Manager to include 11 Promises as a Team Member.
All teams should agree on how they will manage time during a meeting. Unless noted otherwise, the leader keeps time and the rest of the team is subject to the skill of the leader to keep the meeting on track between topics and to end the meeting on time.
That is quite the task. The leader is already busy managing the content of the meeting! Why not ask for a little help from another team member to manage time during a meeting? Here's how to assign the role and what it entails.