Not sure about others, but from my personal experience I did not have to wait too long for the so-call 'hot' models.
For the GMT, I placed my name on the list with several ADs for the metal bracelet model. Got the first call about 2 months after. However, I was outstation when I received the call and could not make it back to KL on time. Had to let that go. The second call from a different AD came about 2 weeks after that.
For the BB Bronze, got the call after 2 weeks from 2 different ADs.