It is either very busy or sort of slow. You typically will have at least one meeting that lasts about a half an hour with the rest of your account manager teammates so everyone can be on the same page regarding who is doing what and what the status are of projects.
You will spend a good part of your day at your desk, watching your email and possibly making phone calls to clients or team members in other parts of the organization. You will also spend time interfacing with colleagues to get answers to questions or check in on the status of a certain asset. The environment I worked in was very quiet on the whole and people used headphones to listen to music or whatever.