Lee is fine for all weather, cragg is very exposed (and a bit too pedally for some peoples tastes) so avoid in the wind.
Lee shouild keep you happy for a couple of hours, longer if you like to “play”. The main route is good for a couple of laps, there’s a red and black option at the far end so try both. In the middle there are a lot of options for messing around, 3 short downhills, a pump track, a more jumpy pump track, a bit of woodwork, a jump track, some practice drops. If you’re into that then that’s another couple of hours worth. A trip up to cragg and a couple of laps of that is another 1-2 hours.
There’s ways to link it up with local BWs aswell if you prefer riding to playing.