I've been told the opposite by Rogers. What they have told me from the beginning is that there was a 3-4 week backorder starting from October 4th, so the phones for those who preordered should start to ship between the 25th and 1st of october. These were the dates they gave me, and so that would mean that at least some people at Rogers use week in the standard english sense (7 days).
I feel like your rep was confused. When there is a shipping estimate it is definitley business days (unless they pay for weekend delivery), and so perhaps she got confused by that?
@Meowmix think I'm right here?