In reply to Neil Rankin:
If you only want a thirty minute walk in you are pushing it, the east and west faces of Aonach Dubh have some excellent
up to three pitches eg. Lady Jane E2 5b (5.10 R), crocodile E3 6a (5.11a), Freak out E4 6a, yo yo E1 (5.10a), Trapeze E1 (5.10a), but to be honest 30mins probably only gets you to the East face, and it is up hill.
You could also consider Glen Nevis below the Ben (Fort William), lots to go at in that grade range and it is valley cragging.
PS, If you want a longer day of moderate climbing in the mountains, Agags groove Vdiff 5.4? is a must do on the Rannoch wall, very steep, but on big holds, a proper mountain day out.
Post edited at 20:30