I recorded short videos in all of the allowed NTSC video formats so that I could see that Bitrate / Data rate of the videos. 4096x2160 @ 24fps - 60mbps 3840x2160 @ 24fps - 60mbps 3840x2160 @ 30fps - 60mbps 1920x1080 @ 60fps - 40mbps 1920x1080 @ 48fps - 40mbps 1920x1080 @ 30fps - 25mbps 1920x1080 @ 24fps - 25mbps 1280x720 @ 60fps - 20mbps 1280x720 @ 48fps - 16mbps 1280x720 @ 30fps - 10mbps 1280x720 @ 24fps - 8mbps If you want to know how much video you can record on a certain size memory card you just have to use the total capacity of your card divided by the bitrate. For example. the 16GB card shipped with the P3 could record any of the 4K formats for the same length of time since they produce the same bitrate. 16,000,000,000 bytes / 60,000,000 bits per second X 8 bits per byte = 2,133 seconds or 35.55 minutes. You won't get exactly this much because the formatted card won't give you exactly 16GB and the bitrate may fluctuate beteen 58mbps and 61mbps. A good rule of thumb is for every 1GB of memory card you can record for 2 min in any of the 4K formats.