Growing new roots?

[ThisIsPhoenix]

So to start things off I am new to the forum, and I'm really excited to see what help I can get from here.

I've done a lot of researching lately on stimulating root growth. I am currently using the "sphag-in-bag" technique on a phal, currently recovering from root rot, with very few roots (one solid 3 inch healthy root and three of four 1 inch roots). I am also using the same technique on six vanda seedlings that I just got yesterday.

Now this all leads up to my question... I am one of those impatient growers that wants to see change immediately, but I was wondering about how long it takes for new roots to start growing.