I like to get to the field an hour to 45 minutes before the game. If I'm on the stick I start putting it on with about 25 minutes to go. I hit the field about 15 minutes before the game, check the equipment, watch infield if it's still going on, then have the plate meeting and get the game started.
In our association we have been told we should be at the field by 30 minutes before game time.
Ummm....we did have one guy show up about 2 minutes before game time this week because he's a doofus and didn't check his e-mail until late that afternoon. His commissioner was quite understanding, and said he'd let the guy's partner know...so check your assignments, just sayin'...