I did it for a 6 hour drive back from Kansas to the Ozarks. The tall paper cup I was spitting in was quite nasty. Amazing how much oil and spit accumulates after 6 hours of oil pulling. The entire way, I was hoping I didn't do anything to get a highway patrol trooper to pull me over. No telling what he'd think of the "open container."
Unfortunately, I've a very public job, so can't get away with streams of oil spurting out of my mouth. Although, the tobacco chawin' men types around here would probably get a laugh out of it, but the prim and proper elderly church ladies would greatly frown on it and I'd be ostracized for life and probably chased out of my job. I do my best with whatever time I can squeeze in.