It depends on the quality of the music files.
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How many hours of what? A typical - fairly high-quality - MP3 needs about 1 MB per minute, that would give you perhaps 17 hours of music in one GB. It is possible to save sound in about 1/5 of this space, and still have a decent (though not excellent) quality; that would give you 85 hours of sound in 1 GB. Ogg Vorbis uses less space (or offers a higher quality for the same amount of megabytes).Low-quality movies need about the same space as high-quality MP3, but a high-quality movie may require several MB per minute. Better check a sample of a movie you are interested in (or music, since music also comes in different qualities), and divide the number of megabytes by the number of minutes, to have an estimate.How many hours of what? A typical - fairly high-quality - MP3 needs about 1 MB per minute, that would give you perhaps 17 hours of music in one GB. It is possible to save sound in about 1/5 of this space, and still have a decent (though not excellent) quality; that would give you 85 hours of sound in 1 GB. Ogg Vorbis uses less space (or offers a higher quality for the same amount of megabytes).Low-quality movies need about the same space as high-quality MP3, but a high-quality movie may require several MB per minute. Better check a sample of a movie you are interested in (or music, since music also comes in different qualities), and divide the number of megabytes by the number of minutes, to have an estimate.How many hours of what? A typical - fairly high-quality - MP3 needs about 1 MB per minute, that would give you perhaps 17 hours of music in one GB. It is possible to save sound in about 1/5 of this space, and still have a decent (though not excellent) quality; that would give you 85 hours of sound in 1 GB. Ogg Vorbis uses less space (or offers a higher quality for the same amount of megabytes).Low-quality movies need about the same space as high-quality MP3, but a high-quality movie may require several MB per minute. Better check a sample of a movie you are interested in (or music, since music also comes in different qualities), and divide the number of megabytes by the number of minutes, to have an estimate.How many hours of what? A typical - fairly high-quality - MP3 needs about 1 MB per minute, that would give you perhaps 17 hours of music in one GB. It is possible to save sound in about 1/5 of this space, and still have a decent (though not excellent) quality; that would give you 85 hours of sound in 1 GB. Ogg Vorbis uses less space (or offers a higher quality for the same amount of megabytes).Low-quality movies need about the same space as high-quality MP3, but a high-quality movie may require several MB per minute. Better check a sample of a movie you are interested in (or music, since music also comes in different qualities), and divide the number of megabytes by the number of minutes, to have an estimate.
A gigabyte is a measure of infomation [storage]. An hour is a measure of time. The two measure different things and, according to the basic rules of dimensional analysis, conversion from one to the other is not valid. There would be a huge difference between the storage requirements of basic audio and high quality video, for example.
How many hours of WHAT? For a decent quality MP3, you can estimate 1 megabyte for every minute, and a gigabyte is 1024 megabyte. The storage space required may vary a lot, though, depending on the quality. Movies/videos take up more space, if they are of high quality.
Gigabytes are a unit of storage, not a unit of rate. 10 GB per month = 14.2 MB per hour
It depends a lot, hours of what, and at what quality. For a typical MP3 file (music or other sounds), I estimate 1 MB per minute, so 1 GB would give you a thousand minutes (about 17 hours). However, the space used by sound files, per minute, can vary a lot; I have seen MP3 files that used about 0.2 MB/minute, and whose quality was still quite acceptable. On the other hand, higher qualities (higher than 1 MB/minute) are possible as well.