Mu Lung Training Center(Dojo) Guide

1-As far as I know, permanent beginners can enter, not sure though.
2- All boss medals, obtained by killing 100 same bosses in the Dojo in Solo mode, ARE TIME LIMITED.
The only Eqs that the Dojo give that does have any time limit are the Belts.

Is there a limit on amount of times to do this per day? If not, I'm gonna kill 100 Mano in a single day
And how long is the limit? 1 week? 1 month? 1 day?