I was thinking sunk cost as well, but I don't know if it applies here. Can you call it sunk cost if the thinking is "if I get through this day, it's one less da

I was thinking sunk cost as well, but I don't know if it applies here. Can you call it sunk cost if the thinking is "if I get through this day, it's one less day to the pay off" as opposed to "I've already put so much effort to this, I can't leave now!"?