If you have attention deficit hyperactivity disorder and frequently struggle with estimating how long something may take or find time management in general a challenge, it’s possible that something called time blindness is at hand. “Everyone struggles with this on occasion,” says Ari Tuckman, a clinical psychologist with a private practice in West Chester, Pennsylvania, who specializes in ADHD, anxiety and life balance for adolescents and adults. “But people with ADHD do more so.”