Hi James, the promotion would last until 31 December 2020.
However, there are limited quantities available! Do remember to redeem your vouchers via the Motorist App! :)
Download the "Motorist" app (if you already have the app, make sure it's updated to the latest version)
On the Motorist app, under the 'Dashboard' and 'Drive' section, click on the Esso logo icon, you would then be able to see the "Redeem Now'' and "View Vouchers'' which you can click on to redeem your petrol vouchers :)