Did it on Saturday. Ignored the trail diversions as I've never ridden Afan before and they looked like they were pointing completely the wrong way. (last time I followed a trail diversion was at Thetford and the diversion lead to nothing, so I ignore them now.) Got round in 5 hours.
Some excellent singletrack, some laborious doubletrack uphill into the wind,
but it is supposed to be an epic. Would happily do it again. Watch out for the snowy bit. There are also 3 spellings of Excalib[o|a|u]r.
The final descent is excellent. The ascent of 2000m is a lie by a long way, it's more like 900m.