Please arrive at the venue not earlier than 15 minutes before the commencement of the interview.
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closed as off-topic by medica, Kris, RyeɃreḁd, Mari-Lou A, tchrist May 19 '14 at 9:37
This question appears to be off-topic. The users who voted to close gave this specific reason:
"Not earlier than" means later, i.e. you can arrive 15 minutes before the interview or later. Five or ten minutes before the interview, for instance.