It seems the period of time, at least on my system, between entering a
bad password for sudo and getting a "Sorry, try again." prompt is between 1 and
2 seconds.
Probably closer to 1. Is this too long?
For me personally, yes. I can't speak for anyone else.
Anyway, if you think this is a feature everyone would benefit from
then you should use bugzilla to submit an RFE (Request For Enhancement) against dnf.
Will do, thanks!
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Ds