Threshold for residence reporting for CE.

Starting a role with a government contractor with a TS. I will be traveling to various countries. Each stay could be anywhere from 1 week to 6 months. I will be staying in temporary accommodations, hotels, Airbnb, etc.

I believe the SF 86 said if it's under 90 days I don't need to report it. Should these be my threshold for recorded addresses to report when CE comes around?

I have a permanent residence in the US that I use for legal stuff. I don't anticipate spending more than 30days out of the year there though. This is the most recent address used on my SF86.

Also, probably better fit for another sub but someone here may know. For foreign earned income exclusion, do I need to track everyone I go outside the US to prove the 330 days?

Thanks.