Deposit AU$50 on the Happy Hour offer at 250%. You receive AU$125 in bonus funds, giving a AU$175 balance. At 18x on deposit plus bonus, the turnover requirement is 18 × AU$175 = AU$3,150. Capped at AU$10 per spin, that is a minimum of 315 maximum-bet spins before a withdrawal is possible, and pokies typically contribute 100% while table games contribute far less or nothing. On a 40x welcome offer with the same deposit, turnover jumps to AU$8,900. Run this arithmetic before you claim, not after.
One extra caution on no-deposit spins. Even a perfect run on DESTINY100 cannot pay you more than AU$100, because the cash-out cap sits above any result the spins produce. Treat that offer as a free look at the lobby, not as a route to a payout.