How long is wait for amcas to send letters to individual schools

[osprey099]

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My advisor finally sent the committee letter to amcas but I'm wondering how long is it usually for amcas to send the letters to schools and then for the schools to mark my letters as received? This is the only thing barring me from having most of my secondaries marked as complete

 

[TheShaker]

Is it electronic? It didn't take me more than 2 days between sending, AMCAS receiving, AMCAS sending, and schools receiving.