"No worries. I might wake early enough for the shop, but most of my personal business is done after it closes in the evening, unless I arrange for it to be otherwise beforehand, as well." There were always emergencies, of course. But he didn't see any kind of emergency coming up that would impact this book thing. "So it shouldn't conflict, and don't feel in a hurry to reply if you're busy." While he wanted to do this book, he had to do it around everything else he had going on.
Rolf grinned. He hadn't thought Charlie would turn one down. "Not a problem. You're doing me a big favor by helping me out, so I'm happy to give you something in return." Though he'd of course reference all materials and thank all contributers when the time came.