Contrary to popular belief, generally the amount that you are gifted has nothing to do with how little or how much money you win or lose. It's all about timing! Casinos want to know that you are spending time in the casino. If you walked in the casino and lost $1000 in 5 minutes, you may get $5 in FreePlay next month.
You can find the RTP in the info section of a slot game. The higher the RTP, the more likely you will earn a prize. Consider the Amount: Some online casinos offer small no-deposit free play bonuses of $10. This is great, but other casinos have higher amounts, such as $25, $50, or even $100.