I haved planted my seeds as they germinated, should they go back onto the skybox or leave them on the window seal. How long does it take before they break the surface?
The first thing that the seed does is push out a root.. then it'll push the seed casing (which contains the seedling leaves) upwards towards the surface of the soil. The casing either gets separated by the soil or after it breaks the surface.
As long as you've not planted it 2 inches below the surface it should be ok - seeds have a finite amount of energy to create a root and develop the seed leaves before they need additional energy from the sun or die.
If you've germinated the seeds they only need about 0.5-1.0cm of soil above them.
Don't forget later, when they're ready to be repotted, you'll bury up to the seed leaves in soil anyway. The area under the seed leaves will grow roots (even if they're above the soil quite often).