According to the instruction manual: 4K videos with a length of up to 29 minutes and 59 seconds can be recorded, then the recording stops. And further: When using an SDHC memory card, you can continue recording without interruption [...], but the video file is recorded/played back separately. (I guess this means that you can then record longer, but at the end your video will be saved in 30-minute blocks).

This is an mFT camera with a cropfactor of 2. The lens is equivalent to a 24-64mm lens converted to full frame. Mode M is available on every system camera.