How difficult would it be to accidentally have a hash collision with private key generation?

I was curious about this so I did some quick googling and thought you all may also find it interesting, at least those of you who don't already know:

Using the birthday attack on RIPE-MD160, there is a 50% chance of producing a collision in 890,362,173,273 years.

source: https://pthree.org/2014/05/02/analysis-of-ripemd-160/

submitted by /u/Zek256
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source https://www.reddit.com/r/btc/comments/f77sd0/how_difficult_would_it_be_to_accidentally_have_a/