Years ago I was having quite the problems with neck and back pain. Wound up at the Chiro. He said I had pipe neck from sitting so long at the sewing machine and that after he worked on me, I could only sew for 10-15 minutes at a time and then I would have to get up and do something else and come back later and sew, etc. WEll after sewing for hours and hours every day that was hard to hear, but eventually I got better. I can go now for 30 minutes or so then have to get up and do something else. My iron is where I have to get up and walk to use it, my cutting table too is set up that way. That is the only way I will be able to sew for the rest of my life. So all you young ones out there don't sew for so many hours in a day it may hurt you later in life.