how long can a one month old go between feedings ??

my baby is 5weeks old and he’s been feeding every 2 hours since he’s been born. literally never misses a feeding and it definitely shows haha. but tonight he slept for 4 and a half hours ! i didn’t realize it had been that long because i fell asleep 😭 usually he wakes up

was that too long in between feedings ? should i start setting an alarm to make sure he doesn’t go that long again ?