I love it when we all thought of fancy ways ,the good @BFM101 saw the first thing in his room and thought “quite se Noobs,this is how to torture a fluffie on a budget”.
Loser! You’re a loser! Are you feeling sorry for yourself?! Well, you should be, because you are dirt! You make me sick, you big baby! Baby want a bottle? A big, DIRT bottle?!
From a verisimilitude aspect, the assumption is that she still can drink any water she finds (she should be able to), otherwise it’s 2-3 days based on similarly sized mammals (cats, pigs and dogs).
If it’s only food, then 3-5 days (dog/pig) or 2 weeks (cat).
5 days for a pregnant mare is a bit on the long time, especially since she’s close to term (foal was born alive and not spontaneously aborted due to the stress).
Speaking of which, how long is the gestation time in your head canon? The assumption was that she’s newly pregnant from the previous comic, but she’s carried a foal to full term in 5 days, which is a lot quicker than most head canons.
I wouldn’t worry about it; it’s just my personal urge for things making logical sense, so feel free to ignore or take on board my suggestions and comments.