1. It depends on what kind of quilting. It can take anywhere from an afternoon up...A meander, I can do in an afternoon. If I freehand fancier it can take several days. I don't have pantos, but a longarmer can do a panto very quickly. It also depends on the turnaround time that each quilter has. It can be several days up to a year for longarmers in demand by many people.
2. It depends on the longarm quilter whether they supply the batting and you pay for it, or whether you supply it. Many longarm quilter will have it and it can be cheaper than you can purchase it. I baste the layers as I go. So far, I have only quilted a couple for other people, so I don't have batting on hand.
3. It depends on the system that the quilter has. I do not have a computer for my machine. I do it all freehand.