I can do 12 decline, 12 incline, 12 one handed incline, 12 standard push ups and 12 diamond push ups doing one type right after the other. It is part of my current workout routine that I do twice a day. While I can do it all at once I usually take some breaks. Personally I don't like doing a lot of repetitions when I can just increase the intensity of the workout. I figure 12 repetitions in a set is enough. When the one handed incline push ups were getting easier I reduced the incline to make it more difficult.
A few days ago I did some handstand push ups. There are lots of different push up variations. I am not just going to do the easiest version a large number of times. It would get boring and it would waste time. To answer your question I just did 35 push ups but it was boring and I had a hard time willing myself to continue. I quickly lose interest and when I lose interest I give myself permission to stop before my muscles give out.