FE Hoppy:
Correct answer: never.
And that is where you are incorrect.
Some destinations even make specific mention of the fact that this cannot be achieved in certain conditions.
That's exactly where I am talking about.
Operating in those fields benefits greatly from the 10 minutes but even then will not guarantee a completed configuration after 10 minutes hence the notes on the charts.
I hope you will benefit flying into these destinations one day so you can (then) agree with me.
FlyingStone:
What if you have an engine fire after takeoff that cannot be extinguished? Will you go to holding to burn enough fuel to get you below MLW or land ASAP?
An overweight landing is always allowed subject to conditions, the one you mentioned falls in my book as one of them, like yours!