A crew member is a record their manager keeps: their name, the hours they can work each weekday, any dated time off, whether they can run a shift on their own, and their employment type. A weekday with no hours given means they are not available. A shift outside someone's stated hours, or while they are away, is refused unless the manager types a reason. There is no date of birth on the record: if someone's hours are limited, a note says why, and CineScope holds the window you set.
Each employment type carries a weekly hour ceiling — whatever your contracts say part-time means — and CineScope ships none of its own. A person's hours are counted across every cinema they work at. Going over is marked on the shift that crosses the line rather than refused, and the crew list looks back over whole finished weeks, twelve by default, to show who is regularly over rather than over once.