When climbing the rope or ladder for 20 min, only the first is interesting as that is the part when leaving the body and the room. Then I climb through a hole in the roof and go up and up watching the roof get smaller and such. I think that takes about 1 minute, then I'm in the clouds. Even faster when I'm doing a 'Google-earth-zoom-out-visualisation'

I'm wondering what to do with the remaining 19 minutes.

I tried going back and forth, doing the first bit a number of times. I tried doing all the rope/ladder techniques one after the other.