So does Ed Friedland...
"Regardless, you should practice out of time until you get more familiar with the changes and where they lay out on the neck. Trying to play in time before you know where to go will just be frustrating. There is no time line, you move on when you're ready."
http://www.talkbass.com/forum/f22/building-walking-basslines-lesson-1-a-673787/index18.html
There ya go.
Carol Kaye says aim for the down beats.
Yeah, she recommends marking them off on the sheet.