Uncle Zhang insists on running and exercising, 6 laps a day. It took about 2 minutes to run half a circle. At this speed, how long would it take Grandpa Zhang to run every day?
张大爷坚持跑步锻炼，每天6圈．跑半圈大约用了2分钟，照这个速度，张爷爷每天跑步要用多长时间？
<gadget id="calculator">2 * 2 * 6</gadget>
<output>24</output>

<result>24</result>