How many?

Mate in twos do you think you could whiz through in thirty minutes, without missing any?

92

 Brilliant.

not really how many can you do.

without missing any?  wow, as long as they are not simple queen mates, probably anywhere from none to five.  of course, time would not really be the factor, brains would limit it. 

Probably none if they were all composed by Sam Lloyd. I have yet to see anything in the Daily Puzzle remotely close to the difficulty of his puzzles at least to anyone who is not very involved in puzzle-solving. Many or most of his puzzles feature very unrealistic positions such as a Black King on a board surrounded my White pieces in which it is near impossible to mate in 2 moves unless you do an extended brute-force search.

Not all mate in twos are created equal.  As long as they're realistic positions, then an average of 20 seconds per puzzle is a good estimate for me too I feel, so I'd say about 90 for me as well.

I don't know though, that's just a guess.

  I eat all the beans in that jar so I can answer 0 ahaha.

  So I will not get tired of counting that beans :P

The ones I do are on another site, taken from real games. Of varying difficulty.  You can do mate in one, two, three or fours, among other tactics puzzles. But anyway I take about 20 seconds, but always manage to screw one up before the thirty minutes are up.