It depends on how big of a bite you want to take and what size end mill you use. I think a Bosch Colt will take a maximum of a 1/4 bit, so maybe a 0.030 to 0.060 depth of cut would work. You are not going to cut through a 1/4 aluminum plate in one pass with that router. Spindle HP is not the only consideration, machine rigidity is important also.