Be the change you want to see in the world
I'll start off with a word of warning: Never announce you're leaving unless you are fully prepared to exit that day. There are three possible results from such an announcement:
1) Employer acknowledges your departure, enters your last day into the personnel systems and begins the process of moving on. Despite many of the earlier responses, this is probably the most common.
2) Employer interprets your resignation as treason and immediately banishes you from the kingdom. It's a good thing you thought ahead and packed up your personal stuff already.
3) Employer begs you to stick around a while longer to ease the transition, which prompts the OP's question "How long should she stay?" I think she already knows the answer:
Long enough to professionally transfer her work. That’s a few days to a few weeks depending on the circumstances. If there is a prescribed timeframe to receive any kind of separation benefit, such as two weeks notice to get accrued vacation time paid, then that would play into the decision.
^^^ There are two excellent points here. The first point is professionalism. If all the employer asks for is an extra few weeks, that's hardly unreasonable. Some day her thoughts may drift back to her career days; I suspect she'd rather remember that she maintained her professionalism to the end. What's a few weeks compared to the next thirty years of her life?
The second point is self-interest. Unless there is some absolutely compelling reason to escape immediately (her health, mistreatment, family emergency, one-in-a-lifetime alternative opportunity) it would be unwise to forgo compensation in a rush to get out the door.
MegaCorp gave me 1 day's notice that they were offering liberal buyouts to all 55 years old and older--with a hold harmless agreement. I was out on the road.
Adios, old friends. And Thank You.
Had I been working in Home Office, two security guards and one HR person would have just shown up at my desk to escort me to the front door.
We owe them no additional time.
At least you got the buyout! I don't dispute the accuracy of this anecdote, but I offer a different perspective. We don't owe our employers our whole lives, but we should treat them as well as we
would want to be treated.
Certainly the Golden Rule ought to apply to everyone, although just because not everybody follows it is no reason that we should use that as an excuse to ignore it ourselves.
Were your Megacorp bosses jerks? Of course! They're managers! Duh!
However, ponder for a moment that it's okay to be better than they were; not for their benefit but for your own.
Okay, philosophy class dismissed.