Times on Snowdon more than any other place depend on the weather, mechanicals and your chosen route.
I did Llanberis up then Rhyd Ddu path down at the beginning of October and did it in just under 4 hrs having been met with gale force winds at the top despite the heat wave at the bottom and a really rough route down.
Two weeks later I went back and did Llanberis up to the summit then Llanberis down to the bottom gate at the top of the tarmac road, then back up the Llanberis to the start of the Rangers just below the summit, then down the Rangers and over Maesgwyn back in to Llanberris itself. All in just under 5hrs but had glorious sunshine all the way, and no mechanicals or puntures (apart from cramp half way down the Rangers and a chunk missing out my jockey wheel that I found when I got home).
As with Slowrider, second try and double climb was one of my favourite routes this year, but the first try on the Rhyd Ddu descent was one of my worse !