Infinite Experience Question

[Prince-Varuni]

So, question about this exploit. I left a character in the secret training part for a week, and when I came back to the game, she only gained a few levels, I figured she would have aleast 5-10 or something, but unsure if I misunderstood something. Can you only level up a few times each training? Or do you have to do the calender trick to actually make it happen? I figured since I was playing other games, I just let them be in training for a week and would be fine. I do remember the guide saying 3 levels but I figured it's because they said move the calender 3 days ahead.

Either that, or they patched it up at some point?