It depends what you play, and how much. If you find a $5 blackjack table off the main strip, then you can probably gamble for a couple days just fine. If you stay at a huge hotel with $15-$25 mins, then you may not last long. Or, you can find .25 or even $1 machines and just drink as much as you can.
Or, sit at the sportsbook, play $50 a game, and drink. You can do it on that amount, but you need to be prudent with your cash.