Question: 2 hours of video is how many gb?
Answer: 8.5GB is good for about 2 hours of 'DVD' quality 720p, and many camcorders are 2.8GB per hour. So (8GB / 2.8GB/HR) = approximately 2.86 hours. This is all dependent upon the resolution and compression used by the camcorder. High definition will yield approximately 1/4th the time per GB; 11~12GB/HR.