I gave my official notice a year before my retirement date, they finally brought in my replacement several months later. I trained him for a short period of time, and was told by my boss to go get lost, and to let the guy figure out the rest on his own. I told the guy that I hoped he'd have good luck learning all of the rest of the lab procedures on his own, pointed him to my collection of lab manuals, handed him all of the lab keys, and walked out.
I spent my last few months sitting on the picnic table out in the maintenance shop, drinking coffee, listening to the radio, running miscellaneous errands (of my choosing), and other stuff like that. I did
NO work at all...told the guys that the boss had me training for my final career....Full-time Retiree!!!