Stormeagle

I have a friend on my server who has a lot more free time than others and keeps running the time up on the server. To combat this I told him when he gets on ill increase the day night length so he doesn't run us up the whole way to a blood moon every time we aren't on. Upon changing the server setting I noticed that if I set the number too high it resets the server so that when you log in its showing day 1 at 00:00 hours (even though we are currently on day 28). The highest I was able to go so far in my testing is 360 minutes. Does anyone know if there is a max time you can set the day night length on a server?