Successful (and tiring) day testing Pedometer++ today. My big focus is trying to reduce battery usage to extend the maximum possible session. I've gotten this down to around 9% per hour (on my year old Ultra 2) for a fully tracked, map based workout, which is reasonable but still a meaningful leap from my goal of 4% (which would allow for a 24 hour expedition).

But I still have loads of ideas for things to try and think it should be possible (Apple quotes a max of 35hr for their workout app).