Mark all as read in Gmail

I know this has been done a million times on other blogs and tips websites, but this serves as more as a reminder for myself. First you need to do a search: in:unread
Then selected the tick all box. Search all of Gmail and select tick all box

Then mark all conversations matching this search: Search all of Gmail and select all matching this search

Then click the more box and mark all as read! Done and done. (it might take a while to do it all but give it some time...) Search all of Gmail and select tick all box