You can do this! One bite at a time!
Break it down into smaller tasks and stitch for short periods of time. You will make progress. Stitch them in set of 8-10 and move along to something else. Keeps the frustration levels from increasing due to fatigue.
A couple of tips. Hope that helps!
https://www.youtube.com/watch?v=9QG3cMOjawM
PS: My guess on your original post was off for the amount to cut. Yikes!
"I'm guessing between 224 and 250 depending on math to make the 50x60 size."