Clearly, it's time for some more speculation.
At the beginning of Time, I figured our couple was at the beach, on a weekend afternoon, not far from home. As things progressed, it seemed like they must be on a longer vacation, or maybe they don't need to work for a living. Now I think they are strangers in this land, and have no idea where home is, and any previous life has become meaningless. This whole world is new to them, and deserves exploration and investigation, but oddly enough they aren't particularly stressed about finding food.
Why does that experience sound vaguely familiar to me? Ahh, there it is. How many here have read Riverworld, by Philip Jose Farmer? Or seen the TV adaptations? In the book, people experience their death in the real world at various points in history, but wake up to find themselves on a world dominated by a giant river, and populated with other people plucked out of history. And, of course, there's some mysterious alien-like entities who have set all this up....
So, there's my prediction: this is Riverworld, or more precisely some type of creative adaptation of that basic premise.