Due to hardware limitations, continuous playback is capped at a maximum of 3 hours. After 3 hours, the playback speed will be reduced to prevent the device from overheating. If you have a need for long-duration playback, we recommend setting the playlist to scheduled playback. Please ensure that there is at least a 30-minute interval between the start times of each playlist to protect the hardware components from wearing out too quickly. You are welcome to check the instructions for setting up scheduled playlist playback.