Final answer:
A prolonged latent phase in a nullipara refers to the duration of the early phase of labor before active labor begins. It is generally considered to be more than 20 hours for a nullipara.
Step-by-step explanation:
A prolonged latent phase in a nullipara refers to the duration of the early phase of labor before active labor begins. It is the time from the onset of labor to the point where the cervix is dilated to 6 centimeters. For a nullipara, a prolonged latent phase is generally considered to be more than 20 hours. This stage tends to be shorter in subsequent labors.