Mr. R.’s World of Math

     “Too bad we have no eggs,” said Justin sadly. 
     “Or flour, or milk, or sugar,” added David.
     “Or an oven,” said Greg.
     “If we only had like the instruction manual for this totally turbo-charged flying jalopy,” said Hannah.
     “Where in the world would we get that from?” asked Serena.
     “I don’t know,” answered Norman,”nobody knows…”
     All the students sat around the elevator crying because they didn’t know what to do. They started crying at 5:25 PM and cried until 6:45 PM.

How many minutes did they cry for?