How long will two beers show up on a breathalyzer?

I'm curious to know, how long exactly can two beers be detected on a breathalyzer test? Is there a general rule of thumb, or does it depend on various factors such as a person's weight, the type of beer consumed, and the time frame in which the beers were consumed? Understanding this information can be crucial for those who want to make responsible decisions regarding alcohol consumption and driving.