What is the average duration of labor for a first birth?

• A. 4-6 hours
• B. 8-10 hours
• C. 16-17 hours
• D. 24-30 hours

Answer: (C)

In a first birth, labor generally takes longer because the cervix must dilate fully and the baby must descend through the birth canal for the first time, processes that typically happen more slowly. From the start of regular contractions to delivery, the average duration is about 12–18 hours, and 16–17 hours sits right in the middle of that range. Shorter durations like 4–6 hours would be unusually rapid for a first labor, and 8–10 hours is still shorter than the typical first-time labor. A duration of 24–30 hours is longer than average, though it can occur. So 16–17 hours is the best representation of the average for a first birth.