Maybe this is a subject which has already been discussed before on these boards so I do apologise if this is a repeat... ::)
I had planted my coriander seeds in a tray, as you do, about 7 days ago and was waiting impatiently for them to germinate. Patience is not my best asset....
Yesterday, I had enough waiting and decided to dig them out of the tray and "crack" them open in two, and then replanted them.
I then went out and when I came back home about 4 hours later, the seeds has sprouted!!!! I still cannot believe it has happened so very quickly !! :o ;D