There's really no limit, that I can think of at least, to any sort of Exping. The game used to have that horrible surplus system, but it's been gone for a bit now.
You are given 4 Guildleves every 12 hours(Well 4 options to select whichever Guildleve), and if you want you can hoard them up to 99. It's still one of the fastest ways to get exp, but I guess we're being encouraged to move away from them a little, and grind on mobs in the field.
These leve allowances apply to Battle, Gathering, and crafting by the way. So you have to kind of pick and choose which you'd want to do most in this time.
This used to be pretty fun.