I don’t really get this part:
The heroes don’t have long to be playing chess with Hades either. The longer they stay in the Underworld, the greater the chance of them getting stuck there. “The Underworld is not Hell. It’s purgatory,” Parrilla says. “You’re in this limbo state. Everyone is warning them to leave because Hades wants to keep all the souls that are down there. If you don’t get out quickly you can end up trapped down there as well.”
Why would the length of time they’re down there matter? Surely, just being there is risk enough, but what does duration of time have to do with the danger?
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy