When signing up to currency converter, the toolbar will be added to all your listings within 12 hours tops.
BUT if you have auction listings that have a bid on them, or you have listings that will end in the next 12 hours, according to eBay’s rules you can’t revise these listings which means that we can’t add the currency converter toolbar to them.
You can read more about eBay’s rules for revising listings here: https://pages.ebay.com/help/sell/revising_restrictions.html
If you have any other questions on how to setup currency converter leave a comment here.
Best,
-Tzipi.