It Just Stops Being a Skill Check
We were at the bottom of a structure and got to the top quickly thanks to dimension door and fly spells. Now we're at the top of the structure and want to get to the bottom quickly, but have no more spells.
Luckily, there's a crane just sitting there, with a rope leading all the way down to the ground. I'm sure we can use that to slide down.
'There's a hard, moderate, or easy check for going down the rope. If you pass the hard check, you can essentially abseil all the way to the bottom in one round.'
'And even if we fail the hard check, I take it we will still make it to the bottom in one round.'