Count number of cells in range since last number greater than zero

Hi.

I have a row of numbers that contain usages of a product on a rolling 12 month period. I want to count the number of cells (months) since the item was last used.

For example, I have the following row of data:

Product XYZ 2 2 2 2 5 0 1 1 0 2 0 0

The last column represents the previous month. So in this case, last month, there was no usage and the last time it was used was 3 months ago, because there was no usage last month or the month before.

What formula could be used to return a "3" as the result to show how many months ago as last used?

Appreciated!