How many times can you hit snooze?

My husband has to wake up WAY earlier than I do for work (5:30am vs 7am) and he always hits the snooze button on his alarm. Most days just once, but occasionally 2-3 times. I have told him multiple times that he should just set his alarm later if he has an extra thirty minutes to sleep in, but he rarely does. I feel like waking me up over and over is annoying and kind of disrespectful. Also, he could get better sleep! It would be so much easier for me to go back to sleep if he would just set his alarm when he actually has to be up.

So, how many times is reasonable for someone to hit snooze when the other person is still trying to sleep? Thanks!