The Nikon D6 has a maximum video recording time of 30 minutes for all formats. That limit is dependent upon multiple factors like camera settings, media storage size, camera power, and internal camera temperature. See details and notes below for more information.
Maximum continuous video recording times for the Nikon D6
All Formats & Frame Rates
If the recording time reaches 29 minutes, 59 seconds, recording will stop automatically.
Using SD/SDHC cards: Each movie will be recorded across up to 8 files of up to 4GB each. The number of files and the length of each file vary with the options selected for frame size, frame rate, and movie quality.
Using SDXC cards: Movies recorded to memory cards formatted in the camera will be recorded as a single file regardless of size if the card has a capacity over 32GB
An increase of the camera’s internal temperature may cause recording to stop before the maximum recording time is reached.