It varies by property. Most free play must be used within 24 hours once claimed (when won as a prize). When earned through play, it can be redeemed bit by bit as you like. Some places have a 365 day account balance. Any unused points over a year old are lost. Again, that's some properties. Other properties keep earned points indefinitely. It is an option they have when configuring their PT system - which in Durant's case is Oasis - not that it matters what system they have!
Sorry, this is what I do for a living! Casino gaming stuff!
You’re the man! That’s interesting, I had no idea that the free play fell into two different categories. Another question, in Oklahoma the slots are based on Bingo. So, do the machines use random number generators, or something similar?