[tor-relays] Traffic limitation

Hi, I'm running a Tor relay on a cheap Linux vserver with high bandwidth. I have a traffic limitation of 500Gb per month and was just wondering what would be the best configuration for the network. Currently I've limited the traffic to a daily maximum to prevent it from hibernating a long time at the end of the month. Is this the right way to do it? Or would be better to limit it on a monthly basis. Thanks for an answer! Johhher