An ovulated oocyte, once released, can survive independently for approximately how long before it must be fertilized?

1. Unlike sperm, which can survive several days in the female reproductive tract, the oocyte has a shorter viable window. 2. The oocyte survival window is fixed and short. 3. That window is approximately 24 hours after ovulation. 4. This is why intercourse more than a day after ovulation usually will not result in fertilization. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 28 "Development and Inheritance", p.1320 §Transit of Sperm_