It all depends on what image size and what frequency you are using for the high and low resolutions.
I have high resolution videos of 700K wmv files at 720x480 that are about 5 Megs per minute, high resolution files of 500K wmv at 320x240 that are about 4 Megs per minute, medium resolution files of 400K wmv at 320x240 that are about 3 Megs a minute, and low resolution files of 250K wmv at 320x240 that are about 1.75Megs per minute.
As you can see, it varies a bit. I think it also depends on what program you are using as your editor (but I am not certain of that). These examples were all done using Vegas Video, though some were version 4 and others were version 5 of the program.
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