I read ten pages of a book a day. When faced with a 400+ paged book, ten pages makes very little difference. What was important to me, however, was the fact that I made time to read. Not how much I was reading. Since starting my ten-a-day reading regimen I’ve finished more books than I thought I would, and I’ve definitely read more than if I had stopped. So don’t give up!
Do what you can. If you really feel you should be doing more, see if you can wake up a little earlier or cut out other habits. If you can't, stick to ten minutes until you have the ability to do more. You can even look at your ten minute jog as you keeping in shape for when you do more then ten minutes in the future. But don't give up!