How many crunches can you do in a row?

I'm working out and losing weight at a pretty decent rate. I'm not at the gym I'm just lifting weights at home and getting in cardio by walking and other gym exercises from when I was in school. One of the way I've been measuring my progress is how many crunches I can do and at the minute I'm up to a max of 30. I'm sore by the end so normally I do sets of 20 but is that a lot or a little? This is without breaks by the way they're back to back with no pauses in one sitting.

How many crunches can you do in a row?
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