Halo infinite’s xp boost from the flight was on a timer that counted down at all times, even if you logged out. I feel they should either be like Halo 5’s and be per match or not count down during main menu usage and logged off.
To be honest I think many games have gone that route including the Call of Duty franchise if I remember correctly. Some games do have it where your xp timer starts and stops when you enter and leave a match which I would totally agree with you there. Especially if you get disconnected or your internet goes out, it just goes out the window.
Cheers!