Great, thank you all for your input! Using the estimate of 9GB per day for 2.5K video, it looks like:
- a 128GB card should hold around 13 days of footage
- a 256GB card should hold around 26 days of footage, and
- a 512GB card should hold around 52 days of footage.
Thanks for this data point! It appears you are not getting the max video duration, especially if video duration is similar to the Cam OG, which is FHD instead of QHD. But as you mentioned, maybe other factors are affecting the used storage.