If a person has one drink at 8 o'clock, when will they likely be sober?

The reasoning behind considering that a person who has consumed one drink will likely be sober by 10 o'clock is based on how the body metabolizes alcohol. Generally, the body can process approximately one standard drink per hour. If the individual drinks at 8 o'clock, they may still show effects of the alcohol in their system at that time. By 9 o'clock, although some of the alcohol will have been metabolized, it is possible that the person's blood alcohol concentration (BAC) might still be above the legal limit for driving and may impair their ability to operate a vehicle safely.

By 10 o'clock, which is two hours after the drink was consumed, the majority of the alcohol from that single drink would likely be metabolized by the body, allowing the individual to be sober enough to drive legally and safely. This timing aligns with general guidelines regarding alcohol metabolism and responsible drinking.