From Edge of Darkness Wiki
Wounds recover at the following rates.
- Bashing: One point is regained in 15 minutes.
- Lethal: One point is regained in two days.
- Aggravated: One point is regained in a week.
Your character doesn't have to rest or receive special attention to clear Health squares. They are cleared automatically as the prescribed amount of time passes. The exception is if she is ever reduced in Health such that she is dying (Bleeding Out); this requires intensive medical care.