You run some Hoppe's No.9 down that barrel with a cotton patch till they come out white. That's cleaning a barrel.
That still doesn't take 2 hours. A field strip and a decent cleaning, including treating the barrel right as you said, averages about 30 minutes per pistol at my house.
To answer the question, I usually take 3 if I am by myself, more if someone is going with me (but then I have help cleaning).