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Please note that MB and GB are units of data storage, NOT of time. This question is usually relevant for audio and video files. It really depends a lot on whether it is music or video; and in both cases, on the quality. A typical MP3, in reasonably good quality, might take about 1 MB (note: 1 GB = 1024 MB) for every minute of audio; but it may also be several times more or less, depending on the quality. For movies, a DVD - which has a fairly high quality - uses 4.7 GB for a full movie (about 2 hours); Blu-Ray uses several times that amount (at an even higher quality). But movies are often ripped in a reduced quality (the quality still being quite acceptable), typically at around 200-400 MB per hour.

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Q: How many hours is 1 GB?
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