It depends on the compression used. Usually normal 1,5 or 2 hour movies are compressed to 700Mb to fit on a burnable CD.
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That's 3 hours and 14 minutes.
93 minutes
The movie went for 92 minutes
Obviously an hour long.
None. MP3 is an audio format and hence not really suited for movies. If you're talking about MP4, however, it depends, since the bit rate is not a fixed part of the format, but variable. But, typically, it will be about 700MB for 'acceptable' quality on a 90 minute movie, though this depends on your personal threshold for video artifacts.