After play testing Endless Delve, many people on the team wanted to make it a one day event but we made a little longer so that people with less available play-time could participate. With Mayhem, I can’t recall running one for more than 10 days before and even at that point people are ready to drop out of the event due to intensity of it. I hear ya that more of a good thing sounds better and I’m really glad you’re excited about the events.