It depends on the phrasing of the song and what type of effect you want. I think you'll find in most instances two beats will give the 'normal' echo effect. However, sometimes you'll want four beats or maybe more, depending how you want to catch the song.
I once watched the awesome Roy Thode take the Temptations' "Shaky Ground" and work it with a one-beat echo. Outrageous! It gave the track a 'frenzied' feeling that it doesn't have but fit so well with the lyrics.
As with everything else... experiment. Two beats is probably the easiest but as you play around with different songs you'll see other patterns will work just as well.



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, phasing was what NickNack said - both records on the same beat but when they got just a little out of phase, you get that airplane whine effect. Being 2/4/whatever beats delayed was echoing.
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