Bobbielinks is right on the money. If it's a simple edge to edge: for example meandering or loopies, a no more than 6 hours. But if its custom then it just depends on everything. I recently had my back go out and took me 3 weeks to do a smal crib quilt and a full size quilt because I could only go a little at a time and I also work full time.
I agree with the others here, just keep asking her "sweetly" once a week.
and if you would like to go to youtube, there are lots of videos of people using LA's. I LOVe the sound of the machine, and it amazes me how they look when they are all done.