5 Days to export a 4k 9 hour video, is this normal?

I doubt the hard drive speed is the bottleneck unless the hard drive reads and writes at 3 mbps. The hard drive might be to full. The video below may or may not be helpful. That being said I would like to see your systems sepcs as seen in the video. I want to see the bottle neck. A short screen caputre video would be best but a screen shot will work.
https://www.youtube.com/watch?v=1L-erwmRxAU&feature=emb_logo

Sami's got a good point, although not sure how much difference the lower bitrate will make in your encode time.  It will definitely make a big difference in your file size.  I'd suggest you do a short test at the 2 bitrates and see if there's any noticeable difference on youtube.   

Would be interested in seeing your piece when it's done.  I certainly have no insight into what makes a youtube success.  I cut a piece for a client about 5 years ago that has over 4.5 million views.

https://www.youtube.com/watch?v=nDl0aw3GaXk

who would have thought.... my only regret is that we didn't start monetizing her channel til about a year ago.

The original file is 375GB, 60fps, ProresHQ, 10 bit, 35 minute (GH5 Atomos Ninja). I'm currently moving an additional 200GB to another drive so hoepfully that works (and I don't have to start over). I'm exporting to upload to Youtube for my Fire relazation channel. This will be the first video.

make sure you have sufficient hard disk space for your export and that your destination drive is has been formatted in such a way that allows for a file that size...   The prediction of export time is always a guess and in many cases, I prefer to divide the task up by using "smart rendering."  For example, I set my preview format to prores 422 in the sequence settings and render the entire sequence and then export to prores 422 with the "use previews" checked.  You can check the progress of the render and stop it periodically if you want and check to make sure everything is rendered correctly before doing your export...

But a 9 hour 4k export is going to take a long time...