How is a song's playcount counted? (When does a song gain playcount?)

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As mentioned in the title, when does a song get a playcount?
I tested on iTunes once, and songs listened on iTunes gains a playcount when I listen to the song up to -10 seconds the duration. 
In other words, if a song is 3 minutes long, it gets a playcount only if I listen to it up to 2 minutes and 50 seconds.
How about Last.fm? Is the playcount counting rule similar to iTunes?
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fooooooo

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Posted 3 years ago

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Jon, Community & Customer Services

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Official Response
We define it in our API documentation here:  When is a scrobble a scrobble?  

A track should only be scrobbled when the following conditions have been met:
  • The track must be longer than 30 seconds.
  • And the track has been played for at least half its duration, or for 4 minutes (whichever occurs earlier.)
As soon as these conditions have been met, the scrobble request may be sent at any time. It is often most convenient to send a scrobble request when a track has finished playing.

A key point we like to emphasise between a scrobble and plays is that we're interested in how many times a user has actually listened to a track, not just played it.  It's a subtle, but important distinction when it comes to recommendations.
(Edited)