Count Columns Until Value Reached

In a retail environment we've got hundreds of products with an established breakeven point for each. I can establish whether one has reached breakeven by summing the row of sales data, but I want to know how quickly each product reaches that point.

I need a formula to count the columns (months) and return the number once a given product has reached a certain value.

One issue, is that each product has a different launch date. So I need the formula to ignore blank cells leading up to the product launch.

In my sample data file attached, I've got four products with their breakeven number listed and several years of sales (by month).

I've tried a lot of different formulas. A few from this forum came close, but didn't quite give me what I needed. So I'm really hoping you guys can help me here.

Thanks!