I was in the Inn for about 3 days, during this I got up to about 40k Rested.

I PL myself and usually get about 1k EXP without rested, with it I was hitting 1.3k so it only seemed like roughly 30% boost. (That doesn't include link/chain boost))

Also I think the way rested is used up is broken, they said it doesnt count towards the EXP you get from levequest rewards but everytime I finish a Levequest and have a little bit of rested, its always removed, which makes no sense at all if its not supposed to be used up.