I refreshed a large database this morning (4681 caches), and it took well over 40 minutes. There was no indication of progress, just a spinner, and the text "Refreshing caches... Please wait...".
It would be nice to have some idea on how many caches have been done and/or how long it has taken, and an estimate of how many caches are remaining to refresh, and/or time remaining.
Customer support service by UserEcho