Heterotrophic Bacteria

[Egmel]

I was reading this FAQ about fishless cycling on the PFK website when I came across the following:

Arguably, organic material, such as a piece of fish or some fish food would be the ideal thing to use, since it would also encourage the growth of the heterotrophic bacteria that break down organic matter into ammonia. These might not be present in the same numbers if you cycle inorganically.

Do people think that it would be a good idea to cycle inorganically (using the nice clean liquid ammonia) and then towards the end of the cycle add a laundry bag with some organic matter in to build up the Heterotrophic Bacteria?

Does anyone know how long it takes to grow Heterotrophic Bacteria?