Depending on the length of your reception
    you may typically expect the average length
    of each song to be about 3-4 minutes
    allowing approximately 15-20 songs to be
    played perhour.  I strongly suggest you
    provide a list of MUST  play songs for me
    and a list of 240 songs which will allow me
    to read the crowd and have more control of
    keeping people on the dance floor. However
    your wish is my command . . .