How long does a Spectrum app take to show up in a DNS lookup?

In watching the short demo video, and reading the docs for Spectrum – https://developers.cloudflare.com/spectrum/ – it shows that I don’t have to add an additional entry in DNS for my Spectrum app, and it also shows in the video demo example that DNS propagates immediately for the demo app. (SSH proxy for demo.burritobot.com)

However, when I added a Spectrum app, while the app does show up under the DNS tab, a DNS lookup for it does not work. Not even when it is a brand new DNS name, or when I specify 1.1.1.1 or 8.8.8.8 DNS servers.

How long does it take to propagate the Spectrum name into DNS?

Thanks