It takes about 7 to 10 days for clones to establish roots in soil.
The answer to this question depends on a lot of factors. For instance, the soil medium used, the seedling's age, and the environment in which it grows will all affect when the plant will root and how long.
Do not plant them too deep. You don't want them to be too deep because then the roots won't get enough air and they won't grow well. I suggest planting them about 1/2 inch below the surface.