The couple do know how much goes into it - they've seen me working on various pieces, and her mother quilts, though her arthritis is hampering her hobby and she doesn't do what they want on their wall. Also, she's not so much a friend as someone I have worked with. They're willing to pay whatever it's worth, I just don't know how to go about figuring out what it's worth. They've been debating paying upwards of $1500 for a piece of art to fill this wall, so I know whatever I charge will be fine with them.
Do I charge by the hour, or is there another means of coming to a total that I haven't thought of?
(My apologies for any typos... Typing on my phone isn't easy!)