9:05

This would have to be my favourite piece of IF ever, and not without good reason. It may be short, and pretty much devoid of puzzles, but the story is what makes this such an excellent bit of storytelling. Without giving anything away, the first playthrough appears to be a normal day, but eventually it unfolds into something more. When I first downloaded this, I played through it many times, to find all of the endings, and because of the short playing time I could try all of the possibilities.
It is a short and brilliant piece of Interactive Fiction, that nobody who has played it can forget.