A Neosurf voucher is valid for 1 year, during which it can be redeemed for free in a Neosurf casino. If the voucher is not used within this period, a service fee of 2 GBP per month is deducted from the voucher amount until you use it. For vouchers that have been partly used, you would also be charged 2GBP per month for each month beyond 6 months of last use.