how long does it take for youtube tags to take affect?

I posted a video four hours ago and included tags on it,but they disappeared so I re posted the tags but they won’t work.
Can anyone help me?

There are a few things you should be aware of when you
label your videos: “tags” are only the 3rd most important
element in YouTube’s search-results. Words in the titles
are 1st, and words in the descriptions are 2nd.

And way in front of those three different variables is your
YouTube username. Thus, tags are actually in 4th place,
and as such are the least important element in a search.

(Whenever you do a search, how often do you get videos
at the top of those results with no matching words in the
username, video titles, or descriptions? Just about never.
If you ever do get results like that with no matches at all,
those are the times when ‘tags’ are relevant in a search.)

Thus if you would like your videos to appear near the top
of search results, the ideal would be to have people type
in your username first followed by the title of one of your
videos — if not some of the most unique words.

How to get more Video views – Featuring Megan Fox (adoptafeature Tags)

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