https://wccftech.com/galaxy-s20-8k-video-5-minute-limit/

Only yesterday, we discussed that even though the Galaxy S20, Galaxy S20 Plus, and Galaxy S20 Ultra can record 8K videos, it will use up a whopping 600MB of your storage. For most people, if they purchase the higher-end storage version, they’ll never come close to utilizing even half the internal memory present on the flagship. However, the problem isn’t even related to how much storage 8K video recording will consume, but its overall duration. Turns out, it’s not all that much, sadly.

Despite the Qualcomm Spectra 480 ISP (Image Signal Processor) running in the advanced Snapdragon 865, video recording on the Galaxy S20 with the 8K option enabled is limited to 5 minutes. This means that for 300 seconds, you’ll be capturing 3GB of video data on your smartphone, making it around 10MB/s or 33MP captured per frame. That amount of data throughput will overheat the ISP, and to refresh your memory, this isn’t the first time that Samsung’s smartphones were limited to recording high-resolution footages for a brief period.