I quilt on a LA but do a lot of detailed work. It is not unheard of for me to spend anywhere from 60 to 80 hours on a queen size custom quilt just on quilting alone. Add to that an average of 10 to 15 hours of marking the top. I won't even try to guess the amount of time I spend researching designs and motifs and figuring out how to execute them on the quilt.
The one currently on my rack I have over 80 hours so far. It measures roughly 90 x 108 give or take. When doing labor intensive motifs like ruler work or SITD it takes a long time. You have to go slower to be precise.