If you take too long on calculations during an interview, do you get dinged?

I've noticed that I've often run out of time on interviews because of math, and while I've heard casing isn't about speed, I imagine it's not good? I've run 5 minutes over on interviews because of this. 

Today, I had to do a market sizing question and I guess I asked way too many clarifying questions and spent too much time walking through the calculations I'd do, and that took up like 20 minutes of a 25-minute case. I'm pretty sure I'll get rejected because of that, which sucks because I was pretty excited about working here :/

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