Calculate Case or Task Age in Business Hours

This requirement which popped up a few weeks back - a field which can give the case age in business hours [excluding saturdays and sundays]. There was no function in salesforce which provided me the day given the date. I came about with a round about logical solution - a formula(number with 0 digits after decimal point) field which excludes saturdays and sundays when calculating the case age.

CASE(
MOD(DATEVALUE(CreatedDate) - DATE(1900, 1, 7), 7),
0, (TODAY() - DATEVALUE(CreatedDate)) - 1 - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
1, (TODAY() - DATEVALUE(CreatedDate)) - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
2, (TODAY() - DATEVALUE(CreatedDate)) - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
3, (TODAY() - DATEVALUE(CreatedDate)) - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
4, (TODAY() - DATEVALUE(CreatedDate)) - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
5, (TODAY() - DATEVALUE(CreatedDate)) - 2 - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
6, (TODAY() - DATEVALUE(CreatedDate)) - 2 - FLOOR((TODAY() - DATEVALUE(CreatedDate))/7)*2,
null)