I read this book maybe around 2010, and it follows a duo of kids – I think they were brother and sister. At the start of the story there was some accident like a plane crash or something and then they are like taken to a different world. They are taken to a super awesome house, were they can get whatever they want, though at some point they realize a man who had a box with a timer on it like dies or something when it expires. This causes them to panic and travel to a purgatory type place where people go so their time stops. While they are there, time seems to like pass weird and without realizing it, 2 weeks pass and they are still there. The whole place is known to give off like bad energy so its just fill of miserable people moping around not doing anything – too afraid their timers will expire. There was one specific part I remember and that was the girl talking about how one of the girls was eating a sandwich with mustard, and I just always thought it was gross the way it was talked about.