The usual answer is "five to ten hours. " It is not wrong, and it is not useful, because it never says what those hours are spent on — so people fill them with the easiest activity available, which is reading the company's About page a fourth time. The number is the wrong thing to ask about.
Source: [Dev.to](https://dev.to/resuhive/how-much-should-you-prepare-for-an-interview-a-time-budget-4g17)