The first stage of labor (612 hours) – the time passed by replenishing gas, resting, and eating: The first stage of labor starts from the regular contraction of the uterus to the complete expansion of the cervix. If you are pregnant for the first time (primigravida), your first period will take about 12 hours; if you have given birth before (multiparous), it will take about 6 hours. Performance: contractions