I filed and uploaded my return yesterday via netfile. I checked to today to see it was received and it is still not received by them. How long will that take.

It can take the CRA up to 48 hours after you filed to update your CRA My Account to reflect that they've received your return.

If you received a NETFILE confirmation number, you can be confident your return was submitted. Here's how to track the number down: https://turbotax.community.intuit.ca/replies/3227955