Reptilez, I am not sure how long the lump stayed on, but I would assume for at least a week?
Burmese, I have seen that picture you are talking about, and there was a documentary on Discovery as well. I will post it if I find it.
Lisa, I agree that it probably isnt good to do it consistently. Almost every caresheet I have read usually advise feeding prey that is roughly about the size of the thickest part of the snake. From my experience, boids are more tolerant of larger prey items than colubrids. Ya, I would like to see studies on this subject too.