Josephine
NURSE DIRECTOR EMERITA
Okay, but I'll use a spoiler so people who don't want to look needn't! 

The drain tube is about 18" long and comes attached to a large sharp needle which is pushed thought the muscles and out of the skin where it is cut off. The tubing still in the wound is placed around inside the wound, into any space in the muscles where blood might accumulate. So it usually is around 12" of tubing in there at least !
United Kingdom