You can claim the Progressive Bonus every 4 hours. At the bottom of the game lobby, you’ll find a progress bar - it shows how much time is left until the next bonus is available, and how many you have claimed so far. Claim the Progressive Bonus enough times and you will be eligible to spin the Mega Wheel for an extra bonus prize!
Take full advantage by logging in every 4 hours - the more you play, the bigger the Progressive Bonus becomes.