How often should a player get Blackjack?

[seriousplayer]

Lets say you are playing at a crowded table dealing about 50-60 hands per shoe. Assuming you are playing a six deck game. Statistically you will average about 80 hands per hour. Every hour that you play those 80 hands you are going to get approximately four Blackjack an hour. From what I understood you will get a Blackjack about once every twenty one hands. So 80/21 = 3.8 approximately 4. Suppose you play two hours so the player is expected to get about 8 Blackjacks. There are some mathematical issues I want to clear up. I want to learn the mathematics of the game. What are the odds of the players getting 14 or more Blackjack over two or four hours of play? From what I understand I've heard a lot of stories that APs could lose $3000 within minutes. Okay, if this is the case what are the odds that an AP could win $3000 within minutes?