If Jill watched 72 minutes of a movie that is 149 minutes long, you can determine how much of the movie she has left to watch by subtracting the amount she has already watched from the total length of the movie.
Total movie length: 149 minutes
Minutes watched: 72 minutes
Remaining time = Total movie length - Minutes watched
Remaining time = 149 - 72
Remaining time = 77 minutes
So, Jill has 77 minutes left to watch the movie.