Was the wort covered or uncovered for the hour and a half? If it was covered and didn't get too many airborne critters, you should be OK. Also, the outcome will be slightly dependent on how much yeast and how viable the yeast pitched was.
Bottom line: get a wort chiller and pitch lots of viable yeast to avoid worry, but I wouldn't worry about this batch.
(And if there are issues, just call it a Belgian Sour Porter.)
Oast House Brewing