how many pieces of gum can you flush down the toilet at once?

Not as many as you used to be able to flush.

Regular, commercial, low-flow?  Ahhh screw it, doesn't matter........It's 42.

Hmm tricky question.... I suspect you could physically flush a lot down the loo... say 40-60 at least but whether you should is another matter... I am not sure how it would interact with the sewage system.

i probably wouldnt flush any of them