I agree, your eggs should hatch around 28 days.  But I've had some even 5 days sooner.  Up to 3 days later.  It all depends on the temp.  The colder, the longer.  Hotter, sooner.
 
What troubles me is this time of year.  The mornings have been rather cold and damp for a keet.  A Hen will take her new born babies out of the nest regardless of the weather.  That's why they're considered terrible moms.  It's too extreme for a baby.
 
  I bought plain, plastic Easter Eggs from 
Walmart.  When I find a nest (a needle in a haystack) I take those eggs and replace them with the Easter eggs, when the hen's gone.  It only takes about 6 eggs.  Everyday, I go out when she leaves and I take that days egg.
I keep them on the floor of my basement where it's nice and cool.  Rocking them everyday.
 
  The very night that I catch the Hen being broody, and she won't leave, I run her off and take all the eggs away.  They then all go into the incubator. 
 
  Leaving a hen broody is just asking for trouble.  I know FOR A FACT that mine would be killed in a matter of days.  A coon will know just how to find her. 
 
  It sure is fun learning about those silly birds!