Tho it's been a long time since I was a scout, I can't imagine adequately covering either of those topics alone in 3 hours.

Some basics maybe

Preparedness
"Be able to stay warm, dry, hydrated, and fed; wherever and whenever" - done

Climbing
"Use Good rope, Learn a bowline knot and a body rappel and proper belay technique, keep your knees and but off the rock" - done

If you adequately cover those two lessons it should take you the full 3 hours.