The Long and Short of It
With kudos to Anne-Marie for finding it, here is a picture of weekly post-chemo hair regrowth as documented by Karin Stack.
I started to do something similar with my own regrowth, but as you can see from the 4th picture there's not much for the camera to catch yet. I can see it coming back, but you can't unless you're standing right next to me. I promise to document my own regrowth as it becomes visible to more than just me.
I can tell you that it feels like it is taking way. too. long. to come back!