I completed a refile for 2018. the printout stated that the charge would be $0.00. cra has not received the change yet. how long does it take for their acknowledgement?

Normally you should get the confirmation number fairly quickly. If you are still unable to resolve this issue, please contact our phone support as they will be better able to assist you (*Not available for TurboTax Free users*). https://turbotax.community.intuit.ca/replies/3152013