To use the incubator, place an egg into it by right-clicking. You cannot remove an egg once placed in an incubator.
Dinosaur Eggs take 18,000m (12.5d) to incubate. Chicken Eggs (including Large Eggs and Void Eggs) and Duck Eggs take 9000m (6.25d) to incubate. This time is cut in half with the Coopmaster Profession.