Question: how much 4k video on 64gb card?
Answer: 4K video is a lot larger than 1080p video. In fact, 64gb would allow up to 5 hours of 1080p footage and only 1 hour and 20 minutes of 4K footage. The large difference in size can be explained by framerate, as 4K video requires 375 MB for a minute of footage at 30 frames per second.