Yeah, I figure it would take at least 10-15 years to significantly increase the number of daily bike trips in a city (like in NYC, where there were ~170k daily bike trips in 2005 up to ~510k in 2018 [0]).
The most magical part of Copenhagen was that its bike infrastructure was so incredibly attainable. Over ~30 years, they built ~350km of curbed off bike paths, ~25km of on-street bike paths, and put out consistent bike traffic light signals [1]. None of the things were hard, and roads have to get redone every 10-20 years anyway, so it's super easy to start updating a city. And it doesn't just make the city more pleasant to live it, it also saves many lives and adds years to biker's lives.
The most magical part of Copenhagen was that its bike infrastructure was so incredibly attainable. Over ~30 years, they built ~350km of curbed off bike paths, ~25km of on-street bike paths, and put out consistent bike traffic light signals [1]. None of the things were hard, and roads have to get redone every 10-20 years anyway, so it's super easy to start updating a city. And it doesn't just make the city more pleasant to live it, it also saves many lives and adds years to biker's lives.
[0] https://en.wikipedia.org/wiki/Cycling_in_New_York_City
[1] https://en.wikipedia.org/wiki/Cycling_in_Copenhagen