It takes almost 3 years for a pineapple to fully ripen, if you count from the moment planting until the ripe fruit can be picked.
If you cut off the crown of a purchased pineapple and plant it in moist soil, it will give roots and begin to grow actively. Particularly lucky even manage to grow a real homemade pineapple in this way.
There are more than 80 varieties of pineapples in the world.