There was a guy here in southern MN that missed a curve on his way to work (for real) at 3am, went down an embankment into thick grasses and he was missing for 2-3 days too, in early June a couple years ago.
Family and friends were out looking for him, it was all over the local snooze.
Thing about early June in MN is that during the day you can get pretty hot dehydrating temps, and at night it can dip into the 40-50's sometimes, easily low enough to kill you from exposure.
Guy spent about a week in ICU once they found him, he'd broken his pelvic so he couldn't walk and in that area nobody walks so yelling would be useless.
I think they finally found him with dogs, frickin lucky to live really.
-K