Hello,

Now let's have a look how long our formulas take to compute. I ran
them on 5 pairs of dates, 1 day, 1 week, 1 month, 1 year and 10k days
difference and got from FASTEXCEL:
Biff''s SUMPRODUCT 10.61 ms
Mike' NETWORKDAYS 0.23 ms
Biff''s SUM 0.15 ms
Bernd's INT/MOD 0.11 ms

Regards,
Bernd