People labor at all different speeds, and every labor is different, even for the same person.
Generally, labor takes longer for the first child and less long for following children.
For people having their first child, labor generally lasts between 12-18 hours.
For people having their second, third or fourth child, labor generally lasts between 8-10 hours.
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Sources: www.mothersadvocate.org, The Birth Partner by Penny Simkin with Katie Rohs. https://www.lamaze.org/parent-information