MPEG-1
Bitrate 17.85 Mbps
Frame rate 29.97
File type VCD
File size 120.36 MB
I did a quick comparison with two of my own files
away.mpg
2.37mbps
25fps
49 Mb
2m 36s runtime
howto.mp4
8mbps
29fps
829 Mb
13m 51sec runtime
For your file to be twenty minutes runtime it would need to be either about 1Gigabyte long (or more) or its bitrate would need to be more like 4 or 5 Mbps
Go try the same properties on a different file.
My calculation was that your 120Mbyte file would runtime around 36 seconds so 2 mins would be in the same ballpark, not 20 mins.
If you can't solve the problem - Change the problem