An American Robin will incubate her eggs for 15-17 days.
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Robin eggs need to be kept at a temperature of 70 to 90 degrees Fahrenheit. If they get to hot don't try to cool them off with water just let them sit in a shaded area for a while and hope that they are still alive. T~O~L
The correct term for a pregnant bird is known as "gravid" and they usually will lay eggs within a 2 to 3 day period after carrying them. These eggs will then go on to hatch within a 12 to 14 day period after the Mother's incubation starts and they will eventually leave the nest within 14 to 16 days after hatching.
Almost none. The egg might not break when falling to the ground but in the absence of incubation by the mother Robin, the egg has virtually no chance of surviving. If you find an intact egg that has fallen out of a nest in a tree, you may be able to incubate it artificially and a live chick will emerge.
Between 10 and 19 days is commonly quoted amongst birdwatchers but eggs hatched in aviaries invariably take 14 days. While a longer incubation period for eggs laid in habitat could possibly be the result of disturbance, a shorter incubation period than 14 days is exceedingly unlikely.
The american robin is actually a type of thrush, wheras the european robin is a true robin.