Didn’t Clossius do a 24-hour Go stream recently? On the 16th of February?
I seem to remember something like this too, but wasn’t able to find it.
However this is what I did find.
I dunno if they still run it, but there were the iron man tournament on KGS.
20 rounds on 5 days, 6hrs between each.
Checked the KGS archives
Last was hold in 2017
In 2019, 2 mini Ironman were organized, one on 3 days only and the next on two days.
Remember we have an announcement history now
But good memory
I knew because I played a simul game against him on the day~