How many "buy-ins" do you really need to feel safe at your current stakes?

[uptrendfinancialsignal]

Since this morning, I’ve been calculating numbers in my head. People say 20 buy-ins is fine, others say 50 is the minimum. Only God knows how someone is supposed to feel “safe” in a game with so much variance. Even with 30 buy-ins, one bad stretch can shake you.