There is no end to your endurance. You have some personal source of power, some action or circumstance that restores you to full vigor. This can be things like making love to a new lover, making a blood sacrifice, succedding with a heroic rescue, speaking out against evil, taking a drinking bindge and so on. It must require roleplaying, and be a challenge to achieve or have some negative consequence.
When you successfully activate your source of power, you recover all lost WoundPoints, Fortune Points, Magic Points and other points you have expended, just as if t was a new play session. You recover from most curses, deseases or poisons - except those that have a plot reason to remain. It might even restore you after a failed DeathTest, at the referee's option.