how long does it take to break through dirt

Depends,

did it crack before you put it in?

if not it could take up to two weeks.

If cracked i would say 2-5 days.

bongsmilie
 
how long will it take for my seeds to sprout and break through the dirt

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.
 
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