Free Bets are paid as Bet Credits and do not have a fixed expiry date attached to them. Your Bet Credits will however be forfeit and removed if your account is inactive for 90 consecutive days.
Players simply have to deposit 10 and place a 10 qualifying bet within 30 days of opening their bet365 account to be eligible to receive your welcome bonus. Once your qualifying bet has been placed, players will then have their 30 in free bet credits accredited to their account.