Etiquette for replacing GMs in Offseason

First offseason as a commissioner and wondering what the etiquette is here for replacing GMs in the offseason. We have a GM that was in the playoffs, active all season, but did not participate in Arbitration. He hasn’t logged in since Oct 27th and hasn’t replied to my email about renewing. Our league came from GDR where there was no offseason and once the season was done you shut down until February/March, but the other 11 owners are all active through the offseason. I threw out a deadline of Jan 15th, but some want Dec 15th. Technically he has paid until March, so whats the rule or general feeling on when its okay to remove a GM?

Some good advice in this thread: