PS4 account sharing, how's the primary PS4 going?

I plan to share my games with my neighbors (I trust them completely). However, I would naturally like to continue playing on mine. And to the question of whether I can activate PS4s as primary for an unlimited period or how often I have not found an answer… Hence the question: can I activate the PS4 as my primary there and then specify mine as primary again so that the games can still be played there are?

You can activate your neighbor's PS4 as the primary PS4 and leave yours as non-primary. You can still play your games! Provided there's an internet connection.