We are having our first pool installed tomorrow! We priced in-ground pools, but it was just not worth the money (to us). With a good quality above-ground and a nice deck off the house around the pool, the look is similar for about 30% of the cost.
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 hours. The average half-life for Concerta in adults is about 3.5 hours.
Re: concerta how long to take effect. You should see the effects within an hour or two. If the dose is perfect, you don't feel anything, you just become more focused and productive, like yourself on a particularly good brain day. However, it may be that 18 mg is too low for you.