MileKing ~ At Hyatt if you're spending $100/night (including taxes) it would take only eight nights for a free room, and that's not even including airline bonuses, elite bonuses or promotions.

Also, during their Nights after Nights promotion which they run every year, if you were to stay eight nights in the three or four month period (however long it runs) you'd get your regular free room, *plus* you'd get a bonus certificate for a two night weekend stay.