First-time parents often wonder how long labor will last. Labor and delivery is unpredictable, but there is some research on average labor time.
Evidence on Friedman's Curve and Failure to Progress
How Long Labor Lasts for Each of the Three Stages
Giving birth - first stage of labour
The Stages of Labor and How Long Labor Lasts
Average Costing Labor Best Practices - FieldServio - Published Knowledge Base - FieldServio Help Center
Solved Smallman's Garage uses standards to plan and control
Labor Productivity: What It Is, How to Calculate & Improve It
3 Vital Stages Of Labor: What Happens In Them And What To Do
Contractions and signs of labor
Early Labor First Stage of Labor & What to Expect
Labor Johns Hopkins Medicine
What to expect: the stages of labor and delivery
Labor Contractions: How They Feel, When They're Real, and Timing