Hi, germination got something to do with the Seeds they are different, sometimes it takes up 10 days from planting into soil to sprout. But most Seed take 3-5 days from putting into water-to sprouting out of soil.
Most time it has something to do with the conditions... for example its to cold, or they dry out while germination. And sometimes the seeds are just old.
I store my seeds in the refrigerator between 5-8 degree Celsius