Someone in good shape, with rope and grappling hook, could be over and down in less than 5 minutes. In high school we were required to climb a 30’ rope and slap the gym rafter with one hand, before climbing back down. I got to where I could do it hand over hand, without using my feet, like circus performers do. I don’t believe the stories that our SF were not able to get over this thing.
Not sure where those stories came from that they could not get over. What I was told is SF and Navy SEALS were part of the design testing and they rated each structure for difficulty. I did hear that some designs failed due to that, but I did not hear they could not get over any of them.