How long does it usually take someone to get consistently sub-20?

It completely depends on the individual's talent, dedication, skill, practice efficiency, and time. It could take a couple months, or several years. It took me a bit less than 6 months to go from being able to fully solve the cube by myself to being sub-20, but that could be way less or way more time than it takes someone else.
 
It took me 5 years to become sub-20, and about 1 week after I ditched rubiks brand and bought dayan zhanchi in 2013.

It took me 2 months to become sub-20 using Roux in 2016.
 
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