typically I have found that in regular conditions all of my seeds sprout within 4 or 5 days. it depends on the temp and humidity. I like to put my seed trays on a warm surface to get the soil temp around 80, then they tend to sprout much faster. this could be done by using a heating pad or cables but normally i just use a string of christmas lights under a piece of cardboard. It also helps to keep the dirt misted but not soaked.