In reply to Anonymous:
Here's some collected experience on various afternoon/evening departures from work. All times are for rush hour from city centre. Knock off 25% for off-peak. It depends a lot on whether you are battling to get out of the city or whether you can get onto the M60 easily. These are the closest time-wise from the centre:
Hobson Moor quarry is 40 mins east above Broadbottom. Wiltons 1,2 & 3 45 mins north via Bolton. Pex Hill is 40 mins west along M56 and Helsby is about 10 mins further.
Off-peak ,if you live on the south side as I do, you can reach any of the Eastern Edges within an hour via the Snake Pass and the Staffordshire edges also take about an hour if you are crafty in getting to Macclesfield along the back roads. Add at least another 30 mins for rush hour particulary through Glossop and Stockport for the Peak. Oldham way, you can get to the Chew Valley in about 20 mins from the M60 (walk-ins are all very long) and 30 mins of driving will see you at the mighty Pule Hill. There's also the Longdendale Quarries 10 minutes further out from Broadbottom and New Mills Torrs if it looks like rain as you're heading out to the Peak from Stockport.