What is the expected duration of action for 40 units of regular insulin administered at 0800?

When regular insulin is administered, it typically has a specific duration of action that varies based on dosage and individual response. Regular insulin generally begins to take effect within 30 minutes, peaks around 2 to 3 hours after administration, and can last up to approximately 6 hours.

Given that a dose of 40 units is administered at 0800, the expected elevated glucose-lowering effect would start around 0830. Its effectiveness would peak between 1000 and 1100, and the action would gradually diminish, lasting until approximately 1400. This makes the timeframe between 1400 and 1800 as a more reasonable estimate for when the insulin is still exerting effects on glucose regulation.

Thus, this option accurately reflects the duration of action for that dosage of regular insulin.