Rate of Separation of the Dragon capsule from ISS

The Dragon capsule leaves the ISS at 7:34PM Eastern Saturday with a splashdown on Sunday afternoon. I’ve previously seen the shuttle and other capsules arriving and departing. But I missed the ISS flyovers with Dragon chasing it back in May, so I’m hoping to catch it this time!

But I can’t find anywhere about how quickly the two will take to physically separate and move apart. The shuttle went from ISS to ground much more quickly if I recall correctly. So with a couple of good flyovers on Saturday night (for WA state and much of the country), how many hours before the two are too far apart to watch the chase across the sky. Is five or six hours too long?

I’m hoping they pull away very very slowly and only do the rapid decent very late before touchdown.