Not to be argumentative but I am known for debate, so please don't
be offended when I ask... A couple of Hours? Pardon my ignorance
but how much would I charge for fuel if I knew I had to go get
more in 2 hours.
Typically, folks who use butane torches have 1 or more canisters of
fuel in the shop. When the fuel in the torch runs low, all that's
required to refill it is to insert the nozzle of the refill canister
into the torch. The refill time is less than 10 sec including
getting the canister out of the drawer.
I use 4 different torches depending on the job, a Proxxon butane, a
Bernz-o-matic propane pencil torch, an acetyline/air & a Smith
Oxy/Propane Little torch. Each is better for some jobs than any of