I'm pretty sure that if you increase the day length in sandbox, everything takes longer as well. So you would have more time to heal yourself, or deal with any health problems. That's why the health drop is so fast, it's because the day length isn't very long. But then again, I'm not sure if the day length affects the health bar. I know it affects cooking and reading though. (Just a little bit of info, in case you didn't know.) I can confirm this. The amount of time infection takes is dependent on the game's speed setting as far as I know. I was poking around in the code the other day and noticed that the rate at which you are infected is multiplied by a "game speed modifier" which, while I didn't look into it, I can only assume means that the day length setting for the game modifies the real life amount of time infection takes. EDIT: Added sentence to beginning of post that tl;drs it.