Chart, y-axis option grayed out

I’m trying to make a block chart that has “status” (a single select field) on the x axis and “production time”(a duration field) on the y axis. But when I select status, production time is grayed out, why?

What I’m going for is a bar graph that shows how much production time is sitting in each status. So 2 hours of production time in waiting on approval. Or 3 hours of production time sitting in Designing.

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