Hey there!
Nice to meet you! I'm Randy, an Independent Advisor.
It’s really frustrating to record for 40 minutes and only get 13 minutes saved. This could be due to a few things.
First, what screen recorder did you use? Some tools like Xbox Game Bar or older versions of other recorders can stop recording without warning, especially on long sessions.
Also, the video file might be corrupted or not fully saved. Try opening it in VLC or another media playersometimes they show the real length better. If it still shows 13 minutes, the rest might not have saved at all.
Another thing to check is whether your computer went to sleep or the screen turned off during recording. That can silently stop or pause the capture.
Lastly, even if you have enough space, problems writing to the hard drive can mess up recordings.
Can you try a short test like 15 or 20 minutes to see if it saves correctly? Also, what software and file format are you using? Did your PC stay active the whole time?
Let me know so that I can help further.
Best regards,