>>537692936
Talk with the guy at the entrance of the temple and you'll know why.
>>537693538
It's surprisingly not that much (maybe a month). But with gacha/live services you take it slow, the desire to get things fast is how they FOMO you into spending money. 90% of the content of the game will give you trial characters so you never actually need to roll, and fully completing endgame will just give you one extra character every few years.