I would say 6 or 7 - but no more.
I saw that they had again packed the big stage, and to be honest, I knew it favored Trump. They have to spread out the conversation, so each of them gets less time to talk. He talks more in sound bites, so I think it favors him.
Cruz would benefit from being given the time to reason with people. I suspect a debate champion doesn’t win on the basis of 30 second responses.