Japanese Whisky Masterclass for Two - Key InfoVoucher Validation Your voucher is valid until 01 Jul 20 You must validate book and use your voucher within the voucher expiry date.Duration: This experience will last approximately 2 hours.Group Size: This experience is for two people however there will be up to 6 other people on the day.Weather Dependent: NoThe minimum age is 18 years old.Availability: This experience runs Tuesday to Sunday throughout the year.