It takes 30 minutes for bus No. 8 to go from the starting station to the terminal station (or from the terminal station to the starting station). Uncle Li, the driver of bus No. 8, goes to work at 6:50 every day, departs from the starting point, has a meal and rest time at 1:00, and leaves work at 3:50 in the afternoon. According to this calculation, how many times does Uncle Li have to run back and forth every day?
8路车从起点站到终点站(或从终点站到起点站)要花30分．8路车驾驶员李叔叔每天6：50上班，从起点站发车，中间有1时的吃饭和休息时间，到下午3：50下班．照这样算，李叔叔每天来回要跑多少趟车？
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 / 0.5</gadget>
<output>16</output>

<result>16</result>