When are you done?

[Trace Evidence]

for me, i stop when i cant take a good sized hit off the J without coughin alot. well i wait about 30 seconds, and take as big of a hit i can, hold it in till i cant and while doin that i put the J out, and then thats it. that does it for me. i havent really smoked from a bong, so i wouldnt no abou that