Free spins could only be available for 24 hours or seven days, and this will depend on the online casino site you play on. Blackjack and other table games could be allowed, but the contribution percentage may be as low as 10 percent. It is recommended to confirm this before your play. This could make it more difficult to reach the playthrough and take longer to cash out your winnings. Be aware of the percentage contribution of each game and the games that are allowed.