How much video will 8gig hold when recording in 1080p?

The amount of video that 8GB can hold when recording in 1080p depends on the bitrate of the video. On average, 1080p video at a bitrate of about 8 Mbps can take up roughly 1GB per 10 minutes of footage. Therefore, with 8GB, you could expect to record approximately 80 minutes of 1080p video, assuming consistent bitrate and no other storage overhead.