Give up, or keep going?

I worked for many, many hours this week on a project for work that seemed like it would never end. About halfway through, I was out of my mind tired. I had that defining moment where I could literally go either way. I could watch "just one" episode of How I Met Your Mother for the millionth time and squander the rest of my time, or I could push on and just get it done. Today, I pushed on and finally FINISHED.