So, for a while now, I've been tracking my progress through the campaign and using it as a way to keep an eye on my times and improve them, like so:
I decided to make a public version of the tracker so anybody could use it. Basically you just fill in your latest best clear time, the date you cleared it and date your last best clear was. It's even got pages for the Co-Op and Challenges! I'm not entirely sure if people will find it useful, but maybe someone will.
As for how you can edit it, this page is on lockdown so the template remains unchanged for everyone. If you want an editable copy, just go to File and select Make a Copy. This will add an editable copy to your Google Sheets, and from there you can do whatever you want to it.
Here's the link to the actual public tracker, enjoy!
