roots

[butterfly79]

How long does it normally take for new roots to grow? Is there anything one can do to stimulate the growth?

[Ray]

Warming the growing conditions, and/or the use of rooting hormones will accelerate the root growth process.

[King_of_orchid_growing:)]

Other than what Ray said, there is no way to consistently determine the time frame it takes for new roots to grow on an orchid. Each individual orchid within a given species or hybrid will perform within it's range of speed of growth for that species or hybrid.