As time ticked on, I spent an SC and went for another round. On the last bit of Charisma I had left, I went for one last run... and finally got another Momiji!

...Right as it turned 2 AM. As the rewards screen came up it gave me the maintenance-related error message. I don't know if it "took" or not. And this is going to be bugging me until maintenance is over. How lojng does maint usually take?