I believe the script runtime was 6 minutes for consumer accounts and 30 minutes for G-Suite accounts. Then, sometime around the beginning of either 2020, 2021 or 2022 both account types were restricted to 6 minutes, and it remains so to this very day.
The custom runtime has always been 30 seconds, although I see recent logs of my functions in this category going for 1 minute.
I don't know whether this is in response to a support ticket I logged 3 years ago or not but, in any case, this would be a great development.