Just leveled up to 160 yesterday, thinking that the +1 stamina was just one level after. Oh boy am I going to regret it. Oh well, whatever.

Estimated duration taking DMM into account? One or two weeks?

Going to have to expand my box though, so many new goldies for my team (though many of them will be dupes). Glad to have tried one premium summon yesterday though (despite already having Sakuya, Lyla and Monica and found myself with a shining Gellius).