I rarely cut all at once. Even though I always buy more fabric than required, I've found that cutting as I go helps me not feel stressed about making mistakes. Plus I'm a bit ADHD and doing the same thing for a long time bores me to death. I cut enough to make a few blocks, then go sew them, then cut more. It also helps my body not to sit (or stand) and do one thing for too long. I try to always get up and move around. I don't have nearly as many aches if I do that. Sure, it takes me longer to finish a quilt but I'm retired and not on a deadline so it doesn't matter.