Heat = Quickest way to pack a tube.
I have found that I can pack a tube in about half the time when I use heat. I preheat my tube by wrapping it with an electric heating pad and secure it with 2 rubber bands. Once it is hot I plug my member in. If it is too hot, let it cool a bit. I leave the heating pad on “high” for the entire pumping session. If feels nice and warm. I sometimes wrap a towel around everything for insulation. I can pump for extended time without my unit turning dark as it does without heat. It keeps a healthy bright pink color. This keeps the ligs and tunica warm so the vacuum can stretch things better. What say ye to this, lads?