Playing a two hour tournament, with 15 players, one player had Quad's 4 times and I had it once. This seems a little odd to have Quads so many times.
So, two tables for 75 minutes, one table for 45 minutes, say one hand per minute (too fast), that is a total of 195 deals, say average 7 players per hand or 1365 hands and we get 5 quad's
FOUR OF A KIND probability is 0.000240