Seth Wolpin did the Circuit in 3d0h4m in October 2014. Wolpin was well-versed with the route, having done 10-day trips in 2011 and 2014, just before has FKT trip. Trail Running Nepal reports Wolpin's effort as the FKT.
I tried to follow all of the New Annapurna Trekking Trails (NATT) instead of the jeep track which would have been much faster. I also followed the northern track between Muktinath and Kagbeni though Jhong as this should be part of the NATT system as it avoids the road. It was a fun adventure - not a super fast time, I am sure someone will come along and break it. Speaking of - I don't think Lizzy Hawker was trying to set a FKT when she did it in 5 days, I think she was out for a hike and saving herself for an upcoming race. I'm sure she could smash 70hrs if she wanted. Cheers.
Hi Seth, Attempting it this May. Would like to avoid the use of roads as trails are far more fun anyway. If I do find myself on the road, does this mean my attempt is no longer valid? And confirming the route is from Besisahar to Naya pul ?