The floor is lava

This does not have to be 30 consecutive minutes - its cumulative through your playthrough. So its likely you'll get this naturally in the later game if you're using the jetpack. And you should use the jetpack, its super fun!

But, if you really do want to grind it out on the spot for a whole half an hour, then see the embedded video for a zipline-based method for hanging in the air for that long.