We have 2-3 raids per evening on average. On some evenings we have four ops running (Friday and Saturday evening). Some are static, some not. We also have an ops council dedicated to running ops for new 50s so they can gear up quickly and/or 55s so they can get more commendations.
We use an online tool for operations sign-up, because we ave too many it would be hard to manage by forum sign-up.
There are always people on, it's a very active guild.