Rollover is the amount of times you have bet the original bonus amount before your bonus is released.
For the example below, it is a Sports bonus with a rollover requirement of 5 times. This means the bonus must be wagered 5 times on eligible Sports bets.
The black bar in the screenshot will fill in with red to show the progress of the rollover requirements.
The rollover will update once your bets are settled. Once you have completed the rollover requirements for a bonus, any remaining bonus funds will turn into cash funds.