quads or better?

[vkotlyar]

i play in a game in which there is a daily high hand $500 jackpot. The game last for 6 hours in which 30 hands are dealth per hour. The game is 12 handed! On the 1st hand, you make quad 4s, and one of the players offers you $300 for the hand (u can buy some1 elses high hand). In other words, what is the probability that quad 4s will be the best hand at the end of a 6 hr period.
thanks to every1 who tries this
V