Bahrick et al. conducted a field experiment and studied 392 participants' memories of school friends using yearbooks. They found that even after 48 years, participants had around 70% accuracy in recognizing faces and names. Participants who had left school within the last 15 years had about 90% accuracy in face and name recognition tasks. This study suggests that recall can be accurate over a very long period of time, indicating that the duration of LTM has the potential to last a lifetime.