Confidence Intervals of estimates

Hi all,

just a quick question that came to mind.  When I was interviewing at places like Citadel/Akuna/other prop, sometimes I would get asked to do like a "market sizing" question and estimate the number of windows in a building.  Usually, I just made few assumptions on building parameters to get the number of windows and gave a confidence interval of idk 50 windows or so.  

Sometimes this worked and sometimes I feel like it didn't.  Is there a proper way to give confidence intervals for these types of questions?  (might be a dumb question)

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