I kept reading the title wrong and it confused me! XD I read storytime lines. Not story timelines.

I normally don't do it. For my last novel though, I scribbled one down on paper, mostly to help pick their current age and what age they would be at certain events. I wanted to see the three characters on the same line. Everything was super basic and color coded with different colored pencils.

Sometimes I think it works better to edit after rather than over plan at the beginning if you've got a lot of puzzle pieces that need to fit together perfectly.