75 hours flying in any one month (on the 757 fleet) would be impractical to achieve because of the nature of the work. Crews spend the bulk of their duty and STBY time in crew rooms waiting for connecting flights to link before loads can be despatched. You'll be doing about 30 hours flight time a month. Expect to average about 70 hours a week away from home, and more if you're a commuter.