I'd have to have access to a few things to answer that accurately.
If the map is any indication, they don't have a ton of content.
There are quite a few frames that don't have stamina costs at all.
My thought is that Kinkoid (devs) partnered with nutaku to try to raise funds. Hence, the slow pace to frustrate people into buying stuff. The problem is that's a really dangerous double edge sword. It is more likely to cause people to quit.
I read on their site (devs) that is suppose to be a 30 hr experience. Which I can only assume is wait time.
As someone was already pointed out, this is like day 5 of play, pretty much the entire day.