During the National Day holiday, Mr. Zhang temporarily received a performance assignment and urgently notified 55 students by phone. If each student needs 2 minutes, how many minutes can Mr. Zhang notify each student at the fastest.
国庆假期时，张老师临时接到演出任务，电话紧急通知55名同学，如果每个同学要2分钟，张老师最快多少分钟可以通知到每一个同学．
<result>12</result>