Peak concentrations in the blood are achieved within 30 minutes to three hours, although the presence of food in the stomach can slow the absorption. (dogcare.dailypuppy.com)
For example, from whatever peak concentration of carbon dioxide we eventually reach in the atmosphere, it will take about a thousand years for it to decrease by half, and then another thousand years to fall by half again. (ceassessment.org)
The scenarios can be grouped according to which of the four Representative Concentration Pathways (RCPs) they are most similar to, based on peak concentration of greenhouse gases. (sciencedaily.com)