It takes wisteria years to grow as you have seen it in pictures and also rather difficult and needing a strong wall to support it against a house. Just admire other persons efforts.
Yes, it takes at least seven years to flower and sometimes much longer.That's why not many people have the patience to wait....it isn't always successful or reliable either.
There is a new type of Wisteria on the market called Amethyst Falls and it says it grows on the first year - and it also flowers twice... My original Wisteria took about 4 years to grow and I bought an Amethyst Falls last year and it flowered this year..