90 minutes after shocking last night, I used the OTO test and dilution method and thought it should be a hair darker, so I added in the rest of my 4th jug of bleach (728oz total added last night). (Figure my pool might really be 25,000 gallons, haven't done the math yet, need to get on that. Plus we had a lot of rain last week, and despite backflushing, I'm still a couple inches high, right at the top of the skimmer).

This morning, once again using dilution and OTO, chlorine is somewhere between 9 and 15. Water still looks nice and clear. Going to work now, I'll measure when I get home.