I use SeeMusic to render a 8 mins video like so:
The duration is 8mins & 9 secs. And here is the finished file, only 2mins and 13 secs
Link Youtube: https://youtu.be/cgBPfO5yNIc
Especially, I have spent a half of a day to waiting for it render but the result make me unexpected. Pls fix this or I will use Synthesia Instead
The file seems to be rendering perfectly - here is the video I rendered using the settings you are using:
If Synthesia works better for you, by all means please use it for this!