I have never had anything that took that long. I have exported a  48:18 minute video in a resolution of 1360 x 768 as AVI and it took just over 4 hours... I had various transitions and text incorporated in the project.

You might have other applications running in the background that are using a lot of those system resources so there could be a problem there.

You should try doing a MSCONFIG to shut down these startup programs and allow Windows a bit more flexibility, which in turn will help the program out. I do this for larger scale projects for both Audio (Samplitude) and Video (Movie Edit Pro 16 Plus)... I have made this a standard workflow, just as saving after every major edit. 

MSCONFIG

This is a utility by Microsoft to allow advanced users to setup how Windows and installed protocols within Windows operate.

To open the MSCONFIG, go to the Start button of Windows and then to the Run function, type in MSCONFIG and press OK. This will open the dialog for the Microsoft System Configuration.

For safety reasons, you should ONLY manipulate the Start Up tab, by selecting that tab. In there you will see a list of applications, protocols and utilities such as antiviral, spam blockers, firewall utilities, printer utilities, chat programs and maybe more.

This Start Up tab represents the programs and applications that start when Windows is started, you may or may not uses these daily, but they are running in the background of your computer and do take up valuable resources from Windows.

Some will be considered a necessity by some, such as a antiviral software, spam software and such, but for this test purpose we should turn off everything and test to see if by doing so eliminates the problem or situation you are having.

So, with that said, use the Disable All button on the bottom (do not worry, you are not removing any of these, you are only telling Windows not to start them automatically, they will all be useable and accessible from the Program directory). Once you have pressed Disable All you will need to reboot the system. You should notice that the system restarts faster, and you will be prompted with a system notification telling you that you are under a manual startup or different start up as previous. I highly recommend you allow it to show you that message over and over until you know for sure the problem is solved.

You close out of the MSCONFIG that opens and the attempt to execute the program that was having problems to see if this has helped at all.

If it has, then you can safely assume that something within that Start Up tab has been causing a issue, so, what I recommend is that you turn on one thing at a time, starting with Antiviral softwares, as those usually never cause issues… and they are somewhat of a necessity for online activity. Then test the program again, keep turning things back on and testing one at a time until you notice the issue again, then note that the last thing you turned on is probably the issue.

You can check with that manufacture to see if they have any updates, as it could just be that to fix the situation.