what is your work schedule? If you are 'AT WORK' in the morning hours, you can do the flush after you've rested and gotten up; whether that is in the same day or not. Just as long as your stomach is empty.
My schedule is a little strange in that I go 'IN TO WORK AT' 6PM, so I won't get off until 4 AM. Once I get off, I'm going to sleep. So I won't do the SWF (Salt-Water-Flush)
until I get up later that morning, say 11AM or even noon. By that time, I'll have an empty stomach after sleeping for 5-6 hours.
This morning/afternoon was the start of my very first flush. I didn't get up until 10:30 AM and was on the phone until 12:45PM,
so I started the FLUSH at 1:00PM
(even though it's not 'morning') for me, that was upon rising.
I'd had nothing to eat, so my stomach was empty).
AFTER that 1PM flush, I had the runs with 30 minutes. Having 3 bowel movements in 45 minutes. By 2 PM, they had stopped.
SO you won't be 'running all day or hours on end' after the flush. If anything, all the water you'll be drinking will cause the 'running' ! :)
You'll just have to figure a time that fits YOUR schedule. Like pepe said, you should do the SWF (Salt-Water-Flush)
on an empty stomach.
Hope that helps,