As a result of recent changes, the Bitcoin network priorities transfers during rush hours based on the fee that is paid to send them.
The higher the fees, the faster they will confirm and become available for you to spend.
To accommodate this change we have optimized the fees that we pay for payout transfers as follows :
The fees that we now pay for payouts depend on the payout amount. If your payout is greater than 0.333 BTC, we pay the highest fees to ensure that your payout will confirm as fast as possible, in the very next block or the one right after it (that is, within a few minutes), even during the busiest times.
Payouts smaller than 0.333 BTC are guaranteed to confirm within X blocks, where X is equal to 1 divided by the payout amount (disregarding all digits after the decimal point and not more than 24 blocks).
So for example, if the payout amount is 0.26 BTC, it is guaranteed to confirm within 3 blocks (up to 20-30 minutes at the most busiest times). Payouts smaller than 0.04 BTC are guaranteed to confirm within 24 blocks, which might take up to 3-4 hours during the busiest times.
Note that most of the times, the Bitcoin network is not busy, and all payouts, small or big, are likely to confirm very fast, within seconds or minutes.
I put a bet on your dice and won a little amount, is there any chance that the payout transaction will be rejected due to small fees?