There's no direct connection between exposure to HIV and development of AIDS or other advanced symptoms, there are simply too many factors involved to provide anything other than vague estimates.
For example, left completely untreated HIV usually takes 10-15 years to develop into AIDS, but some people progress that far in only a few years, and some never reach that point. Even if it were predictable, a difference of a few months for exposure would be insignificant to a decades long progression.
Basically, HIV attacks the immune system, making you more susceptible to other infections and diseases. AIDS refers to the late-stage condition when your immune system is no longer functional. Before that, though, it's just a matter of your immune system become weaker over time, but people have different immune systems, different risks, are exposed to different things, etc.
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