How many more days should I give them before I give up? they can't be in there forever!
Sorry to hear about your past few days. Its really stressfull, specially when its our 1st time.
One thing you should of done was post a pic of your incubator, that was people here could help you out better.
Next thing you should do is water candle it.Warm water. And good luck.
I would keep them in until they quit, or the end of day 25. You counted the day you set them as day 0 right?
Check them tomorrow afternoon, by candling. If alive - pop them back in the bator. If no movement, water candle. If no movement, then you have to decide whether to shut off the incubator and walk away, or slowly open the air cell of one to see what is going on.
It's a tough call at that point.