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Measure your blood pressure.

Measure before consumption. Take three different readings.

Measure at one hour intervals after caffeine consumption.

Fast metabolizers BP should return to baseline within a couple of hours.

Mine would remain elevated for 10-12 hours.

I'm assuming elevated is purely relative to your baseline?

Oddly, I don't think my blood pressure changes much at all. Will try this test again, though.

Did you measure your baseline blood pressure without caffeine as well?

How many hours/days/weeks should you be caffeine free for the baseline BP?

A couple of days.

I usually have to go through a withdrawal headache first.

Yes.