Very rare; only their husbands know this about their respective wives.
To those husbands who have found the “wife of noble character”, you’re “Blessed” Indeed.
It doesn’t end there with “character” only. The chapter further reveals many other traits including the fact that she is “good at making her own money/trading and running the family too” by herself.
Only those wives who “fulfill” these characteristics as mentioned in Proverbs 31 can truly be called the “Prudent Wife” as the Bible defines it as such.
Good luck guys in finding one.
My personal advice is this:
It’s better to remain unmarried and only marry if you find such a “Prudent Wife” who matches the “Bible’s Criteria” to be satisfied (learn “wisdom” from His Word first before making any decisions).
Remember, it is stated as a “question” (“who can find?”) and not as a statement proving this must be rare.