Hi #87384,
I am late answering your question. My computer is in very sad shape. It is dead.
If you take a 2 cup coffee solution standing up its perfectly ok. The solution needs to stay in the sigmoid section and in the rectum and need not go higher.
The retention time should be around 10 to 15 minutes. I do not like to exceed 30 minutes.
Hope this helps.
Propaul