It depends on the type and shape of pasta. Whole wheat pasta takes longer than white flour pasta. 7 min for whole wheat sphagetti, 9 min for rotini. 13-15 min

It depends on the type and shape of pasta. Whole wheat pasta takes longer than white flour pasta. 7 min for whole wheat sphagetti, 9 min for rotini. 13-15 min for that rigatoni definitely sounds excessive. The "throw it at the wall, and see if it sticks" test is about right!