I don't like those rapidly rotating 'chaingang' pacelines because I don't believe anyone gets enough rest.
When I pull during club rides, I go for about half a mile (depending on speed, how I'm feeling, or how long the ride is).
AFAIC, a (say) 8-man paceline, where each person pulld for half a mile, gives you a tough half mile and a 3-1/2 mile rest. That way the guy taking the pull is pretty fresh - and that's how the group is able to maintain a decent speed.
I once did a century with an 8-man paceline where each person pulled for a mile, while the others rested for 7 miles. Our average speed for the century was over 19.2 mph, and we were all in pretty good shape at the end.