It usually takes me 30-60 minutes after I drink the SWF (Salt-Water-Flush) to have to go to the bathroom. Make sure you are drinking LOTS of water during the day...that will impact your flush as well.
If you don't like the cayenne, here is a suggestion. Don't mix it in your lemonade. Mix it with a small amount of the lemonade and take it as a shot. You get it in and done quickly. Then you can sip and enjoy the taste of the lemonade.
Do try to take the minimum recommended 6 portions of lemonade a day. Remember that is your only source of nutrients, and you really don't want to be skimpy.