It's not always easy to give exact timings! Things like working out the sett can take some time in itself!
I expect to get a kilt made from the bolt to sewing on the label in a comfortable 26-30 hours,this for a handsewn one. Working on a Dalgleish wool is nicer than a Marton Mills wool but this might be just a personal thing. I generally make a kilt over several days, I can't hand sew for a complete day without a break, at least my eyes can't take it!