I've posted this picture several times in saddlebag threads.
There's a Park stick-on boot and a couple glueless patches folded up next to one of the tubes. The blue stuff on the tire lever is duct tape.
Using both tubes in one day is rare but it happens. What happens more often is getting a flat 10 miles into a 120 mile ride and not having a spare for the other 110 miles.
There's a lot of different opinions on what to carry. I know people that do double centuries with one tube and one cartridge in a pocket. I know others that carry giant expandable saddle bags with everything but the kitchen sink.
One thing I recommend is carrying light or extra light tubes because they fold up smaller.