The Nikon D5 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 D5
All Formats & Frame Rates
If the recording time reaches 29 minutes, 59 seconds, recording will stop automatically.
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.
An increase of the camera’s internal temperature may cause recording to stop before the maximum recording time is reached.