If you’d like to suggest a way to capture/track that in a simple formula that would take <30 seconds to find/enter every day, I’m all ears!
Just speaking for myself, I’m personally less concerned with ride uptime/downtime (seems impossible to track and could be all over the place) and more concerned with the technical joining a BG / # of BGs called process. The thrill-data link I provided above has lots of charts on ride operations (scroll down the page for more detailed charts) - to me they are providing the most simple/effective way to visualize uptime/downtime on a daily basis (and it’s in charts so easy for dumb people like me).