You know many times our minds, in the heat of the moment, remember things differently. Our perceptions can be off and how we remember something can be different from what other people remember since we're all different.

I remember different things from a wreck I was in when I was 12. Things that only took a split second to happen seemed like they happened in slow motion.

I think maybe in your situation you were dissociating from the shock of things...and your mind most likely was all over the place while you walked to the house, which can definitely make it seem like the walk was longer.

Hang in there.