The midwife admitted a full term G1P0 with a vaginal examina…

The midwife admitted a full term G1P0 with a vaginal examination of 6/100/0 station at 0300, the same time she experienced spontaneous rupture of membranes (clear).  Her contractions have been adequate.  Assuming Category 1 fetal heart tones, and using contemporary labor progress guidelines, the midwife can safely allow labor to continue without cervical change until_______: