How did/do entrepreneurs measure their productivity? Did they write down goals?

Sometimes when I go to bed I kind of feel like I'm judging myself harshly on whether I did enough, or not enough. I once read that you shouldn't measure "being busy" with "being productive", and it seems like I'm living in panic-mode most of my time thinking about whether what I'm doing is productive.

So here is what I'm looking for....

I'm looking for techniques that past-entrepreneurs have used to track their success? Basically I want to know, what did they write down? How big were their goals for the day/week/month? How did they know if it was big or not big enough?

Also, did they have any advice on their time? In other words, did they spend 18 hours straight each day on business, if they took a break (say 1 hour each day) to watch tv/play video games, or even eating dinner with their families, how did they get over the "gee, am I being productive by doing THIS right now?" mentality?