If you aren't sure, there are several kiosks around where you can check to make sure that you have accummulated enough time. You won't get a voucher, it is all tracked on your card. If you want to move to another machine, just be sure to make sure that you still have accummulated your 30 minutes of actual 'card in the machine' time. There is no minimum $ you need to spend, just accummulate 30 minutes of play. You can play pennies, nickels, quarters, dollars.whatever you want. Take notice of the time, and after you have played for thirty minutes, you have accummulated 24 hours of free parking.
If it isn't flashing green and you can't get it to move from red to green, then you are either putting the card in incorrectly, or you need to move to another machine. You will get a message showing your name (just Michael, no last names) and the light will flash green.
When you begin your slot play, be sure to insert the card into the machine. It is the same that it has been for as long as we have been going there' You don't have to be any particular 'level' of player, all you need to do is stop by the Total Rewards Desk and get a Total Rewards card.