Agree with Drew...I also think most of your time will be spent on subcoms, including but not limited to drafting emails, responding to assorted questions/issues, and following email trails on various topics. One week will be somewhat busy and the next week very slow. It's not extremely demanding, but keeps you on your toes at times.
It's a committment, but also has it's rewards. I enjoy it for the most part. It's a labor of love.