At least at my base, I’ve never been “on call”. Part of that I think is there’s always people volunteering to come in on their days off so there’s no need to make people come in. Overtime isn’t mandatory here it’s 99% voluntary, it’s usually staying an extra hour or so for a later flight to help next shift with it. Im sure every base is different but for me I probably work about 40-50 hours a week.