I wouldn't worry about small quantities like that. It should be good for a long long time, particularly a quality synthetic made with modern methods.
One time, a lot of years ago, I had an experience with a transmission fluid that was left in storage tanks for a number of years. When it was put in MT series automatic transmissions, they would overheat and aerate.
We actually rebuilt some of those units, but noticed if we just changed the oil and filter they were fine. Supposedly, the additives in the base oil were settling out.
Consider this an interesting tale from an old man. I don't know if such a thing could even happen today. Never experienced it since.