PhilosophicalCat
NCM, I heartily agree!
The simple answer: ES seems to be cumulative. You don't go so much at night, so you can take the first dose shortly before leaving work. After that, it seems to really keep you bowl-bound for about 2 hours after each drink. The last ES drink is mostly (but not all!) through your system in 2 - 4 hours. However, sometimes you're still going hours later.
For example, because of my work hours, I had to tweak the timing a bit: I did a flush last night, with ES taken at 7:30 pm, 9:30 pm,
OO (Olive-Oil) at 11:40 pm (going to the bathroom multiple times threw my timing off a bit), then again at 7:30 am and 9:30 am. Now, it is 11:59 pm after the flush (more than 12 hours after the last ES drink) and my insides are still noisy and I feel weak. So don't be in a rush!
At any rate, you will feel weak and mildly ill later. Best to do this with a whole free day to relax and recouperate. Two days off are even better.