Mr. R.’s World of Math

     “I thought you were brave Norman,” said Serena.
     “I am brave until I see something scary,” said Norman as he started screaming again.
     “Hey, like what happened to Greg?” said Hannah, “He’s totally not in his leather chair anymore,”
     “He’s vanished!” yelled Justin.
“Really Greg, come on out,” said Hannah, “we know you’re hiding.”
     But Greg didn’t come out and the students started searching around the dark elevator looking everywhere for Greg.

They’d searched for 5 x 12 minutes before they finally gave up looking.
How many minutes had they searched for?