I usually can only last 5-10 minutes. When its five minutes, I repeat the process. I tried oil swishing several years ago when I got Andreas Moritz 's e-book on the Keys to Health and Rejuvination, but did not do it on a regular basis. I tried Sesame Oil first, then tried again with Olive Oil, but that was too much like Liver Flushing :(
I am having some financial problems right now since I've been on medical leave with spinal problems, so Sunflower Oil was all I could afford, but its worth every penny.