That was my calculation exactly. The question was not "when do you run out of pills", but how long do the pills last.
They last thirty minutes each, don't they? Or is the third pill a placebo?
Obviously the first one lasts an hour and the other two are placebos /sarc
I understand your point. You are correct, if that is what the question meant, but based on the answers, it meant how long would the pills be available. The third pill is essentially gone after 1 hour.