I've mentioned this before a few times over the years, so why not say it again for the new guy.
At 30k miles I did my first final drive oil change. My wife had a business relationship with Maxima oils at the time, and had the owner's phone number. She told him I ride and he said to call him anytime with questions, so I did. His advice was "change it with synthetic, and forget it, don't bother changing it every 30k miles". I mentioned it was a bike that I planned on putting over 100k miles on, he said that didn't matter. So I followed his advice. About 10 years later I changed it again just in case. So, two changes in 23 years and 116k miles, with no issues. People like to discuss lubrication related matters like its a life-or-death decision, but its really not that big a deal if you pour the right oil for the application into the hole (and the OP did).
You can change it as often as you like, but I'll take the word of someone who founded and owns a motorcycle-based lubrication company any day.