Talk:Relena's Challenge!/@comment-24302298-20161122042209/@comment-122.52.51.47-20161122054827

Assuming that 1 key lasts 30 minutes (even shorter depending on how fast you can clear it) and you only use the keys Relena freely gives away for this event, you get to train in the Hyperbolic Time Chamber for a maximum of 4 hours per day. You can then slack off for the rest of the day. Very fitting for the lazy, laid-back attitude of Relena.

Still, you're free to buy keys to Relena's room the Elemental Hall from Alchemist and train even more if that's your thing.