~800 is quite good. I just ran a test and it comes to an average of ~1025us after the system has booted.
Under load, uploading music to Google, it stays at an average of ~1025 and from time to time, when I want to open a program, a spike near the 4000-16000us since uploading music to Google can take a lot of resources.
Unless you notice performance issues, I don't think you should be worried about ~1000us.