It really, really depends on the relative skills and stamina of your players. If you have a low stamina, low skill player being backed up by a very good player it will be a more even than if you have a star player with high stamina starting with a scrub backing him up. (of course, game shape factors into this as well)
How close the game is will also impact minutes. Once you pull way ahead you can expect the coach to clear your bench.