I pretty much covered the top of my soil completely with pelletized lime one time, when i was just getting started growing, and was freaking out about low PH(about 5.3). Then I took a long skinny probe(about 9") and worked it down into the soil, letting it fall down the holes i made.(just wait.LOL) THEN, I dissovled handful of lime(8-10 tablespoons) into a couple 1 liter bottles, making lime milkshakes.(practically) After that, I poured the mess into the pots until it ran out the bottom, and the runoff was cloudy with lime.LOL And believe it or not, it didn't hurt them one bit. I was shocked, myself.LOL So yeah, even though I wouldn't recommend that method, they are able to handle quite a bit of lime.
Oh yeah...it was the 5th week of bloom, and they were in 2 gallon pots. Got about 3 ozs off each one.(3 1/2 feet tall)
EDIT: I forgot to mention that they were getting nutrient lock before that, and the lime actually saved them.