How many hours do you get with a 3GB dongle?

Answer 1

I will assume you want to store music, perhaps in MP3 or Ogg Vorbis format. In fairly high quality, every minute of music takes about 1 MB. (But you can store several minutes of music per MB in lower, but still not too distorted, quality; on the other hand, you can have VERY high quality, with several MB per minutes). The estimate of 1 MB per minute would give you 3000 minutes, or about 50 hours (2 days and nights) for the 3 GB.

If you want to store movies, the situation is different. A minute of fairly LOW quality video may also take a MB, for a more acceptable, but not very high, quality, you need several MB per minute.