I know that conception is a multi-step process. A sperm fuses with an egg. Its contents diffuse into the cytoplasm. Dad's DNA is transported to the nucleus. Proteins are gradually made from Dad's DNA. Do we know how long that process takes?
I'm most curious about conception in humans, but information about other species is welcome too.
EDIT: The time I'm interested in is between the fusing of sperm and egg, and the first transcription of the newly incorporated paternal DNA within the zygote's nucleus. However, if conception is better defined by different events, feel free to correct me. I'm far from a specialist in the subject.