If you wanted to qualify for a withdrawal to rollover an amount of €1,000 and you only play roulette, you would need to bet 1000/0.25 = €4,000 in total.
Zum Beispill, wann Dir d'Rolloverzuel an der Roulette treffen wëllt an de erforderleche Betrag total € 1000, muss Dir wetten: 1000 /0.25 = € 4000.