If there are 12 people in a painting group, and the teacher has an urgent notification to convey to them, if the notification is made by phone, and each call takes 1 minute, how long will it take to notify everyone?
如果一个绘画组有12人，老师有一个紧急通知要传达给他们，如果用打电话方式通知，且每打一个电话需要1分钟，最少花多少时间就能通知到每个人？
<gadget id="calculator">1 * 1 * 2</gadget>
<output>2</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<result>4</result>