Nice observations, iusedtoberich.
As for the length of the match, yes, brutal. Kind of like snooker events. In this event, it looks like the match-length limits started at 90 minutes, then 120, 180, 210, 240, with the accompanying frame limit based on 6 minutes each, running up from 15 to 40. I don't think the clock runs during either racking or timeouts (10-minute scheduled timeouts). From the lag to the end of the 33rd rack was about 295 minutes (5 minutes short of 5 hours), which is nearly 9 minutes per rack counting racking and timeouts. Using the clock time of 240 minutes (or, say 235 to the end of rack 33), it was 7.1 minutes per rack.
From what I can tell, the third-place playoff and the final will both remain at the 240 min. / 40 frames level.
Chu vs. Zhou at 11:30 am tomorrow (Saturday) there, which is 11:30 pm today (Friday) EDT.
Wu vs. Zheng at 6 pm tomorrow there, or 6 am tomorrow EDT.