This is the tricky part. I am happy to oblige what ever legal requirements you might have, or at the lower end of the scale send you an email stating that you are free to use the images. The only thing we would require is that if the images go in a book that my name is in there somewhere. . . it’s good advertising.
Of course if you already lined up with a publisher they will likely have some very fixed ideas regarding usage and delivery.
If there are to be legal wrangling then we may charge some time for this as it is far far less enjoyable than drawing!
In terms of turnaround times, it could be just a few hours to a few weeks depending on the order, but if I am anything at all then it is hard working, so you’ve lucked out in that respect!