If more than three days, then the president can make a recess appointment. So, recess appointments are OK, it's just that the Senate needs to go a minimum of 4 days without a session to be considered in recess.
Sure it did. It gave a very clear roadmap -- where none had previously existed -- as to how the Senate could prevent recess appointments. The Senate has followed that to the letter, and there hasn't been a recess appointment since.