How many tubes does it take you to glue a tub?
 

Im happy with the method I follow for gluing my tubs with Mastik one.

4 road tires glued, very difficult to get off. Gluing my CX tires on now.

Per wheel/tire, starting with whatever left-over crap is on the rim (chunks removed), it takes me about 2.5 tubes to glue on the tire

1 tube = 2 thin layers on the rim
almost 1 tube = 2 layers on the basetape of the tire
a little more than .5 of a tube as the last tacky layer on the rim to put the puppy on.

How many tube equivalents does it take you for a single tire start to finish?

About 1 if everything is bare clean. Less than that when the rim and/or tire already has some glue from an earlier mount.
But I only use one base layer each surface, then a tack layer on the rim.