For how long are my vouchers valid? Corbin Flak February 09, 2018 05:03 Updated Follow All vouchers are valid for 12 months from the date that they are sent to you. Related articles How do I redeem an ONS course voucher? What is the cancellation/transfer policy for courses purchased with a voucher? What is the bulk pricing for the ONS/ONCC Chemotherapy Biotherapy Certificate Course? What is the bulk pricing for the Fundamentals of Chemotherapy Biotherapy Administration Course? What payment methods are accepted for voucher orders? Comments 0 comments Article is closed for comments.