I have noticed that using some filters create larger file sizes than others on export. I was wondering, if there is a way of predicting how large an export file will be? My problem is that I do 8 hour long videos, but sometimes the file size exceeds YT limits of 128 GB.
8 hours video on YT?? Who is going to watch?
Really - i think you should definetly split your videos in smaller and easier digestable parts 
Whats your content? - just curious
In general all filters that bring out more detail like contrast and sharpening will increase file size. The more detail, the larger the resolution and the higher the framerate - the higher the file size will be.
For 1 h in 1080p 30fps in mp4 h.264 you can roughly estimate from 1 GB (with very low quality) to around 16 GB with resonable quality - of course you can always go higher 
Long relaxing sound and visual effect for sleep and relaxation purpose. To be honest, I have never had a problem till this latest video.
You might want to look at this post:
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