If your business is closed during weekends and holidays, then there should
be no activity on the data during weekends and holidays. If that is the
case, then this simplified solution will capture 5 work days worth of
activity. This is a technically inaccurate solution, but realistically if
you take any consecutive 7-day period, there will always be a Saturday and
Sunday stuck in there somewhere during which there is no data activity. The
"problem" with this solution is that if you have an extended holiday weekend
(3 or 4 days?) then you'll end up with fewer than 5 working days worth of
data.
Sorry for not getting it right the first time and hope that this helps you
find a solution that works for you.