I believe you could compensate for a shorter boil time with the recipe. I don't know exactly how, but I speculate that you could. I've heard that melanoidin malt does a good job of taking the place of a decoction mash. I think it might also do the same for a 3 hour boil. Again, just speculation.
Primary: Robust Porter from BCS.
Bottled/Kegged: Crappy Bock (my first brew!), IPA, Manny's Octoberfest, Paulaner Hefe-weizen clone (my first all-grain!), Ed's Honey Oatmeal Stout, Dos Equis clone, Pumpkin Spice Ale (my first ruined batch), American Red Ale, Angel Wings from BCS, Edworts Apfelwein, American Wheat from BCS,Terrapin Rye Pale Ale from CYBI, Munich Madness from BCS.