system
Given the following post, respond as if you're commenting on Reddit:
human
If you were to lose a Liter of blood, how long would it take your body to make that amount of blood back?
gpt
The plasma would be replaced very quickly; as soon as you ate a meal. The volume would be replaced within 6 hours. The red blood cells can take up to a month to regenerate. This is why you can't give blood more than once a month.