Yes, there is usually a betting limit at a blackjack table, which is set by the casino. The limit can vary depending on the casino and the specific table. Casinos typically have both minimum and maximum betting limits to ensure that they can manage their risk and maintain the integrity of the game.

That being said, here's my advice: Keep in mind that it kind of depends on how long you plan on playing, as well as the variance of the game you'll be playing. A decent rule of thumb is to bring at least 100 betting units (for a 4 hour session). So if your betting unit isR$100, then I'd bringR$10K.