The percentage of those of Hispanic origin in the United States who were of Mexican background in 2013. Another 9.5 percent were of Puerto Rican background, 3.7 percent Cuban, 3.7 percent Salvadoran, 3.3 percent Dominican and 2.4 percent Guatemalan.
Onset of effects occurs within 30-60 minutes after taking Concerta. After that, duration of action lasts from 8-12 hours. And the average times to reach peak plasma concentrations across all doses of Concerta occur between 6-10 hour s. The average half-life for Concerta in adults is about 3.5 hours.
Re: concerta how long to take effect. I'm on 36mg twice a day. Assuming you don't have a placebo effect, at the dose you're on, I wouldn't expect you to be aware of any difference in your vitals or conscious state, other than possibly noticing a subtle ability to focus more on tasks for longer periods of time.