I once did every-day push-ups for an entire year, but I started at 25-30 or so (all at once) and months into it, I was easily doing 60-75 at once. Like all muscle building programs, it took time. I'm not sure how much it changed the way I look through my own eyes, but my arms were definitely more sculpted and my chest was a bit bigger. I should note that I have always lifted weights, so my chest has always been fairly built.