How much dark root is acceptable for an interview?

Anonymous
i have highlights all over my head and they are blond. my natural hair is a very pale warm brown. next to brunettes it doesn't look blond but it looks very light compared to a typical brunette.

anyway with highlights the roots are not as drastic as full dye. I just got them done but in about a month or so I may be interviewing for summer jobs,

how much root is acceptable for an interview? I only get them done every few months. if there is just a little bit showing is that okay? I just got them done a week ago.
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that is an example my hair is like that but my roots are lighter than hers because my natural hair is not that dark of a brown. see how it is blended because it's highlights not full color.
How much dark root is acceptable for an interview?
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