MuseScore 4: The duration counter resets to zero when the playback ends
When the file playback ends, the duration counter resets to zero when it stops. This didn't happen before (4.2), and it's extremely useful for me to keep that information as it allows me to improve certain things to adjust the duration to match, for example, the length of a video or similar things.
Comments
You don't need to play a score at all in order to see its total duration. Simply click the final barline.
But also, if your goal is to synchronize with video, be sure to check out the "VLC Sync" plugin - see https://musescore.org/en/project/vlc-sync-film-scoring. It's a pretty amazing tool for helping synchronize a score to a video, making the video start automatically in the correct place any time you play your score from any position.