When do you call it quits?

I have been quilting alot for me, about 35 hours a week. Yesterday I could do no wrong, every seam matched. At 1:30 am everything was still going great.

Today not so good. It was sew and rip, sew and rip. I cut a whole strip at the wrong width. I had one seam I re-did NINE times. I cannot just throw it out and start over because it is a kit and I dont have extra. In the end, it still never came out. It is without a doubt the worst seam I have sown in years.

I just had to get up and walk away or I would have throw the whole project in a tub and stuck it in the closet. Maybe in a few days I can come back to this.