A patient has an order for oxytocin 30 units in 1,000 mL of D5W to begin at 1 milliunit/min and then increase by 2 milliunits/min every 15 minutes until regular contractions occur. Maximum dose is 30 milliunits/min. Calculate the flow rate in milliliters per hour 2 hours from the start of the infusion. ____________________ mL/h