The Olympus OM-D E-M1 Mark III has a maximum video recording time of 29 minutes or file size limit of 4GB (whichever occurs first) 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.
Details
Maximum continuous video recording times for the Olympus OM-D E-M1 Mark III
Format
Limit
All Formats & Frame Rates
29 minutes or 4GB
Notes
Individual movie files can be up to 4GB in size.
Continuous shots can be no more than 29 minutes in length.
Depending on the card used, recording may end before the maximum length is reached.
An increase of the camera’s internal temperature may cause recording to stop before the maximum recording time is reached.