"up to 50%"

It says that meeting fairies can increase the training rate of the skills they represent by "up to" 50%. Is this a total 50%, or 50% per day? I'd like to know before throwing today's candy at the same fairy I used all my candy on yesterday only to not get any boost at all.

EDIT: Nevermind, figured it out myself.

What conclusion did you come to?

Probably that 50% is the maximum for each Fairy boost, and that it remains at 50% until the end of the event, once you reach it.

That's correct. It will say 1.5, which is to say 150% of the experience you would have gained, you gain.