When Recording the RAW video, FPS has a dramatic affect on File size.
RAW video recording with Doubling of the Frame Rate = Double or More the File Size.
Then there is the Encoding process.
The More Important Function of Encoding is the BitRate.
Bitrate of the Encoding is what effectively determines that file size.
You can Have two Video's of the Same Dimension.
1080p for example
One Encoded for 30 FPS at 128Mb/s
and
One Encoded for 60FPS at 128MB/s
Both Videos will be about the same size.
But the 30 FPS would probably look better, because Each Frame Displayed, will have High density of Bits.
About Double the Bit Density of the 60 FPS video.
The 60 FPS video might increase in Size as there will be more Key Frames Needed.
To Keep the same Quality of Video, and Also Increase to a higher Frame Rate,
then you Also need to Increase the Bitrate as well.
Doubling the Frame rate and Doubling of the Bit rate would result in More than a Doubling of the File size.
But it is the Encoding Process that takes the Biggest Hit..
Increasing the Frame Rate means Processing twice as many frames, and then also Increasing the Bitrate Will add another doubling to the Processing time.
So About 4 times the Amount of Processing Time required.
The Team is already taking close to 24 hours to Process / Encode the Video Clips...
If the Frame rate and Bit Rates both Increase, then it might take More than 2 Days to Encode a single card.
Remember, that the Encoded Video, every Frame depends on the Information of the Previous Frame.
You Need all of the Bits from the Previous frame to decode the Next frame correctly.
and so on, and so on....