How important is beating the demon generals pre-100 days? It seems quite difficult to achieve that in a time frame that's also actively seeking out other benefits like reading proficiency pre-useless knowledge, or Herman's Trademond discounts, or enough trust in Nephlune to acquire shadow cloak. 

Aside from their strength increasing, are there any consequences to beating them past 100 days? I'll be *very* strong by then, in part because I minimized pink scenes til I could acquire lascivious coating, and am maximising the amount of pink scenes I perform on days I'm coated. Magic will not scratch me.  I'm getting hit by thunderbolts ignoring half my magic defense for 1 damage lol.