How should I determine how to count a content view?

For text, is it a mere visit? What about multimedia, should there be some threshold of watched/listened length before a view is counted?

How about repeated visits? Should they count the same or should there be a window where multiple views are counted as one?

What if user keeps refreshing the page to increase view count?

Should one user be counted always as just one view?

etc... any tips on this topic?