Hi I change ip address on DNS how long to update website

Hi I change ip address on DNS how long to update website
I still get message

Error 521 Ray ID: 54e36e85da1c83b1 • 2020-01-01 09:22:58 UTC

Web server is down

That isn’t an error due to the IP address (if that is correctly set), but an error with the server itself.

A 521 error happens when Cloudflare is unable to make a TCP connection to your origin server. Review the suggestions in this Community Tip for Quick Fix Ideas.

Thank working now i forgot allow port 443