How long it takes for a firebase hosting to work?

I followed the instructions, and deployed a simple web yesterday. At first, it kept showing the default website, saying " you've deployed successfully...", not my web. Also, the 'firebase open' command + "Hosting: Deployed Site" leads to a undefined site:' undefined.firebaseapp.com '.

But, magically, about an hour later when I open the link from 'firebase console' again, the web showed up... I am not sure whether 'firebase open' command worked cause I didn't try.

Today, I added some features, and deployed again. In the firebase CLI, it said deployed. But, the link still showed the old version.

I'll catch up an hours later to see whether it works, but even it works, it takes too long.

has anyone had the same experience? what's wrong with my web?

Thanks.