In reply to Mark Stevenson:
Hehe, just spotted this thread... and some familiar names popping up!
The 'Big Six' is still my favourite day out in North Wales, but it's rare to find all the routes in good condition whilst not too busy... and you need some luck getting parked!
For those looking for a challenge, it's as follows: Start at Pen-y-Pass car park, up to Lliwedd and climb Slanting Buttress; Avalanche, Red Wall & Longlands; Horned Crag Route, then back to the car. Drive round to Tryfan then up to Heather Shelf for Gashed Crag, Pinnacle Rib (either), and Grooved Arete. The clock stops when you get back to your car!
Three successful goes so far... 15 hours a few years ago, then 13:30 in 2016, 14:37 this year (Lliwedd was pretty greasy so we were slower than hoped). Great fun to move quickly on dry North Wales rock