The spreadsheet is saved on Google Docs, and Google must have changed their link. I am not sure why I could not edit my original post to update the URL, but am reposting the the updated link.
This is not a definitive list. It was simply my compilation of thoughts and opinions people were sharing regarding maintenance intervals. If there was more than one opinion, I used the more conservative (frequent) interval. Please consider this a starting point. You should be able to download the spreadsheet as a .xlsx file and make any adjustments you choose.
Hope it's beneficial to you.
Porsche 911 Maintenance