I was reading the fine print....
Harrah's (Owned by Caesars) 90 Days
Bally's (Owned by Caesars) 1 year
Resorts 1 year

One would think the Caesars Entertainment properties would have the same expiration period. I also find it interesting that Chips and Tokens are always redeemable in AC but the TITO's are allowed to have expiration dates.