Try this:

=SUM(N(FREQUENCY(IF(Task="Painting",MATCH(Week,Wee k,0)),MATCH(Week,Week,0))0))

=SUM(N(FREQUENCY(IF(Task="Drawing",MATCH(Week,Week ,0)),MATCH(Week,Week,0))0))

Both formulas are required with CRTL+SHIFT+ENTER, not just ENTER


" wrote:

Hi,

Can anyone help me please.
I have a spreadsheet and I am trying to calculate how many weeks a
task took to complete.
The task does not necessairly have to be completed in consecutive
order.

A brief example:

Week Task
1 Painting
1 Painting
1 Drawing
2 Drawing
2 Drawing
2 Drawing
3 Painting
3 Drawing
3 Drawing

From the table the Painting task was completed in 2 weeks and the
Drawing task was completed in 3 weeks.

I would appreciate your help.