Ah fair fair. I just noticed my SD card was almost empty, after a day of recording, but that'll have included overwritten files I guess.DR900S/X producing about 192+82MB/min at max, if i'm not mistaken, that's about 56hours (including parking mode). The problem is data density which make this card more prone for failure. And 100MB/s isn't the best speed for transfering a 1TB of data.
But yeah, my curiosity is quite strong so i'm in the process of deciding. If it would be possible to return it, i'll probably try it in my Viofo A129Pro/A139 (don't have any Blackvue cam anymore)