If you just edited or added a new DNS record in your account's hPanel's DNS Zone Editor, you may need to wait up to 24 hours for the change to fully propagate, but sometimes changes become visible within just a couple of hours!
Notes:
After the propagation is completed, don’t forget to flush DNS Cache to see your website.
If you updated an NS or A record and pointed your domain to Hostinger, you can use preview URL or edit the hosts file to perform changes.