Cad east/west is the only sunny day location you can't do all day at (well, and the spur but not many know that location)
West is pants in the morning, east pants in afternoon
Bwlch is ok for light all day.
Settings, I use shutter priority, evaluative metering and + 1/3rd exp (only if using ISO 400+)
Times...god knows, had carparking at 0830 and been in the pub in Dinas at midnight when a herc came over...likewise been carparked by a typhoon at 1930Hrs so stay as long as the light's there.
My normal plan is summer time, arrive 0800hrs, aim to stay till 1930hrs....just depends how much you've got to do/how far to drive etc
Walk up west and middle shelf is about the same, west is easy for 7 mins along the flat(ish) then real tough up the fence, bwlch is tough all the way up, then 7 mins of easy cutting across...
Most of all, follow the countryside code, PICK UP ANY/ALL LITTER (inc fag butts), prepare for the worst weather (it can go from no wind 20d and sun to 20mph wind no sun and baltic in 15 mins) and ENJOY IT
Charlie