In fairness, I actually quoted someone on that point, then agreed with it.

As for how long it took anyone to learn how to land, as someone else stated "Don't worry about "how long" it takes.", as it really comes down to what your ability to relate to the aircraft's orientation is and get your thumbs doing the right thing in relation to how the aircraft on track, as well as the specific aircraft you are flying.
A trainer is generally pretty easy and straight forward to land, where as a warbird is a fair amount harder, with a hardcore ultra responsive 3D monster or jet with really high wing loadings per square cm or inch being that much harder again.

So to answer you query re how long it took someone to learn how to land?, as each and every single aircraft is different (even two of the same model will normally have differing setups specific to the pilot) ....... how long is a piece of string??