I've had seeds crack open in paper towels from 12 hours to 7 days. I'll then wait anywhere from 12 hours to 3 days to get their tap root to 1/2"-1 inch. Then I plant, not deep at all. Only maybe a 1/4" under. It will then take another 12 hours to 4 days to pop up.
The point I am trying to make is that germination, in completion (seed to sprout), can take 3 to 14 days. That a big range, be patient. The reason I don't plant them before germinating is so if a seed is a dud, i don't wait extra time to find out. If you really want, dig it up just a little and see where its at.