Grandpa Lou enjoys watching movies on the Hallmark channel, where every movie lasts 90 minutes.  If, on Tuesday, he watched several full-length movies on the Hallmark channel for a total of 4 hours and 30 minutes, and then on Wednesday he watched on the same channel twice as many movies as he did on Tuesday.  What is the maximum number of full-length movies Grandpa could have watched during these two days?