I had this issue recently. Plumbing customer that asked us to fix his ac. Said he dont' wanna pay for 2 guys, when most hvac companies only send one. [I'm not carrying that bottle of refrigerant, too heavy]
I first asked him why he doesnt call who he used to call. He tells me, well, we can trust you.- BING.
I told him that "Its all the same, buddy. I charge what is fair"
He says, OK then. I charged what we always do. Sometimes you gotta tell people what they wanna hear.
As far as 1 man 2 hours, 2 man 1 hour, Sometimes it works out that way, but not as often as you would think.