OOC:
Well ---

If you want to MS and Hide you can only move 1/2 your normal speed. You can only climb at 1/2 your speed as a full round action.

The cliff is about 50-60 feet high so it will take you 3-4 rounds to climb the cliff. The DC is somewhere around 10 to or around 15. There isn't a whole lot of shrubbery to hide you from the gnolls darkvision and if you want to climb and MS and Hide you'll have to go even slower.

Hope that helps.

If you have time on your side then it won't be a problem - or at least not as much of a problem. If you need to hurry then it will be more difficult to sneak up on the gnolls.

Remember that your also about 70 feet from the cliff so it will take you about 5 more rounds to sneak to the base of the hill/cliff.