If you have a party at 5pm-7pm, then check chlorine values and add bleach immediately after people leave, then re-check about 2 hours later, should you have the same values in the morning? Or are the values going to be lower because it takes time for the water circulate to kill all the 'organic matter' throughout the pool?
I added bleach after a party at 7:30pm. I tested water at 9:30pm (FC=17.5, CC=0.5). Checked water at 1:00pm the next day (FC=13).
Nobody was in the pool after the party until 1:30pm the next day. It was cloudy until about 11am, then the sun came out.
The pool passed the over-night loss test the day before.