Final answer:
The zygote typically hatches from the zona pellucida around day 7 after fertilization, preparing for implantation into the uterus which occurs approximately on day 8 or 9.
Step-by-step explanation:
The approximate time after fertilization for a zygote hatching from the zona pellucida is around day 7. At this stage, the embryo sheds the zona pellucida and undergoes a process called 'hatching'. This is followed by the blastocyst rotating and preparing to implant into the endometrium of the uterus. Implantation then occurs approximately around day 8 or 9 after the hatching has taken place.