Average line holder will block about 87 hours per month. On reserve, hard to predict. With all the training going on, I would expect utilization of reserves to be pretty high.

You can pick up trips in open time so long as you don't go below 10 days off per month. So if you have 11 off in your schedule, you can only pick up one extra day of flying. Open time flying pays at 1.5 times your normal rate, so it is a way to make some extra $ as well.