Today it took me over 2 hours for the contacts on a static list with only 69 contacts to start to populat/appear.
The list was generated during the review of a workflow and I wanted to validate them further by looking. I was a bit shocked after 1/2 an hour and nothing had populated, Etc.
Recommendation - There should be a warning re: delayed list creation/population if there is going to be such a delay in processing (for any reason) including the system load or the type of data being filtered. - The current message "check back in a few seconds" wasn't helpful in this context.