Is this too long for a screenplay?

'm writing a screen play that's about 135 pages so far. It's a comedy story. I'm going through editing it for the second time. I know the general rule is 1 page = 1 minute, but a lot of it is quick witty banter. Very similar to Pineapple Express and Superbad. Should I refrain from adding more to it? Or when selling a screen play, is more better?