hello. How long do I need to wait for the e-mail to verify it? waiting 8h now...

verification emails are usually sent immediately. if there are delays you should check your junk folder, and if it's not there it probably won't arrive anymore. depending on the instance you signed up on there may be alternative methods to reach out to the instance admins about this. note that private messages from mastodon to lemmy do not work unfortunately.

ml's registrations take time, Maybe try .world or other instances

Hello,

Which instance did you register to?