Unrevealed wagers never expire. They remain in My Wagers.
However, if you choose to reveal a wager in a game, there are times when a game can end and the wager "expires" before it’s used. If this happens, don't worry. Any payout associated with that wager is automatically inserted into your Cash Account.
If you don't know the results of specific wagers revealed in a game, check your Cash Account history. You'll notice every revealed wager has a record that displays: the game title, action and corresponding payouts.
If you still can't account for your wagers, please contact b Spot Player Services at firstname.lastname@example.org for assistance.