There are 510 students in the Junior Military Academy. For the convenience of communication, a contact method is designed. Once something happens, the principal will notify the two monitors first, and then the two monitors will notify the two students respectively, and so on, and each student will notify two students. If it takes 1 minute to notify two students at the same time, how many minutes will it take to notify all students?
少年军校共有510名学生，为联络方便，设计了一种联络方式．一旦有事，先由校长通知两名班长，这两名班长再分别通知两名同学，以此类推，每名学生再通知两名学生．如果每同时通知两名学生共需1分钟，通知到所有学生至少需要多少分钟．
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