1357111317,
I posted the following response in another thread a little while ago as someone else raised a similar question. This data was obtained in Atlantic City, though, not Vegas, and there is/was no mention of an ASM:
Table 92 of "Professional Blackjack" is titled "Average Times for Shuffling and Dealing Six-Deck Blackjack in Atlantic City". Granted, it is a small sample size (13 shuffles, 261 rounds of play). From the information provided, a shoe with only one player, on average, will yield 59 rounds, with an average of 12 seconds per round. 59 rounds/shoe * 12 sec/round = 708 sec/shoe, which comes out to 11.8 minutes per shoe for heads-up play. Wong cites that he kept the clock running during "short delays", usually buy-ins, during this study. Using just the information in this table, I got the following values:
2 players: 17.7 minutes/shoe
3 players: 14 minutes/shoe
4 players: 16.3 minutes/shoe
5 players: 24.1 minutes/shoe
6 players: 14.7 minutes/shoe
7 players: 24.8 minutes/shoe
Again, a small sample size, but I couldn't find any other data addressing this question in my references. The author also states that "Mean dealing time increased approximately linearly with the number of players. The average round of blackjack in Atlantic City took about (7n + 5) seconds, where "n" is the number of player hands".
Hope this helps.