#23 - Oct. 3, 2007, 9:21 p.m.
15 tickets from "Bark for the Barleybrews!"
Twice a day (every twelve hours) you can do the "There and Back again" repeatable quest, 2 tickets each barrel, you might average 20 tickets? I'm not sure if there's an actual maximum but I do know you can't go forever.
Then every hour on the half hour you can get up to 25 tickets with the Dark Iron attacks.
So theoretically if you do everything you possibly could in a day and got the ticket amounts listed above: 355
This of course doesn't count any of the one-off quests.