[kjksf]

According to https://en.wikipedia.org/wiki/Tulip_mania it was more like 3 years:

"contract prices for some bulbs of the recently introduced and fashionable tulip reached extraordinarily high levels, with the major acceleration starting in 1634 and then dramatically collapsing in February 1637"

[mmastrac]

From the same page -- the Tulip market didn't start at the time of the bubble.

   Their popularity and cultivation in the United Provinces (now the Netherlands)[32] is generally thought to have started in earnest around 1593 after the Southern Netherlandish botanist Carolus Clusius had taken up a post at the University of Leiden and established the hortus academicus