The Jack rollover requirement is 1x. That is the multiplier of the bonus value you need to wager before the bonus converts to withdrawable cash.
Worked example: a $100 bonus at 1x rollover means you need to wager $100 in qualifying play before the bonus value is yours to withdraw. That figure assumes 100 percent slot contribution. Live dealer, sports, and table games usually contribute less, sometimes much less, which inflates the effective wagering requirement.
What to check in the current Jack T&Cs before opting in: the maximum bet size during wagering (usually $2 to $5), the time limit on completing the rollover (often 30 days), the game contribution rates, and whether any games are excluded entirely. Breaching any of those clauses voids the bonus and any winnings derived from it.
The full expected-value calculation, including realistic completion probabilities by game type, is on the Jack bonuses page.
Score breakdown across seven categories, deposit-tested screenshots, payout times we actually measured, and the bits the operator does not mention in their welcome banner.
Read the Jack review