Question About MGM Text Coupons

Hi,
Signed up for MGM Grand alerts to my iphone and got my first offer today. I'm on a few other text coupon services and all of them have expiration dates but this one didn't. Anyone know how long the offers last? I ask because we don't get there till Sept.

Thanks!

Oh BTW my offer was for unlimited wine at SEABLUE for $17 per person. Mention "always full" to your server.

Can you say "hangover"?