Tubing takes a long time to dry, or never dry, because there is very little air flow. Must not be a problem since most everyone has the same damp tubing problem without infections. No one is even marketing a tubing dryer to take care of a problem that most likely doesn't exist. Hanging tubing without a coil is good.
Flush your tubing immediately after use before any specks have a chance to stick and grow bacteria. A couple times a year I soak my tubing in a weak PBW solution for a couple of hours then wipe and rinse.