I have a feeling that some of you were killing the wrong PH if it took you over 3-hours per pop.
9h, killing correct PH, for first pop. Rest were around 30-45 minutes after window up. The pop system inherently allows for high variance.
(Also, the people/posts who say it's a nightmare were probably the ones doing it while Garlaige had 16 minute repops. Assuming SE didn't have the sense to lower pop rate when they lowered repop time on PH, it would have taken three times as long back then.)