Hello all Master's and Mistresses

I would like to be suspended in the crucifix position, hanging from a solid beam. My biggest fear is falling! Second would be having circulation problems. My Master and I have spent tons of time staring at that beam, discussing how to properly and safely suspend me lol

To those of you that have tried anything remotely close to this: How long did it take to properly knot and suspend your sub? How long have any of you left your sub suspended for? Did you incorporate punishment with it? I guess in general I'm wanting any and all feedback possible on it!

Any thoughts given are greatly appreciated