With my 5d3 raw video I get 24 minutes of 1080p on 128gb. But I have to use a really fast cf card, because the sd cards aren't fast enough. It writes at around 100MB/sec for 14bit raw.
Video cameras can be able to shoot at higher bitrates than a post-processed 25fps Blu-ray, just using the same calculator as that site for 60fps you get 164 GB/hr for 4k
Which is about 45MB/second, about half of the published write speed for these 1TB cards.
The SD standards have been moving up the transfer rates. The UHS-III does 624MB/sec. The new SD Express standard will do 985 MB/sec by presenting a PCIe Gen3 or NVMe directly. (Obviously more contacts, but they are backward compatible with the older interfaces.)
They just announced the SD Express interface for microSD cards as well. I'm not sure any products are available for SD Express yet.
They're of limited utility in this application because of poor write speeds. Most high-end 4K cameras use Cfast, XQD, SxS or SATA recording media, because SD cards are a significant bottleneck.
