see the quack though - this resembles your Lost Wages one too....and that was nigh on identical to the mater....essentially the heart gets out of synch and you faint, heavily, at times.....longest has been an hour for my mother but usually about twenty minutes and part of the trick is keeping her upright and then (ii) getting her back to bed, as she'll sleep for England - in her case, it's usually triggered if she overheats.