I don't think I've ever had one roll of masking tape I ever used completely up,unless I used it immediately--it always ends up welding itself together into one solid mass so you cant un-roll a full revolution off the roll without tearing or going down past the first layer...
Speaking of tape--the white "red cross" medical cloth adhesive tape they sell for things like bandages and casts is waterproof and works great on leaky hoses and other things exposed to moisture,it wont unravel..doesn't go "bad" from sitting a long time either,unlike electrical or masking tape either..