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The analysis focused on a retrospective review of 408 cases with assessments completed between October 2021 and May 2022, conducted by 30 diagnosing teams in Scotland. Data included age, final diagnosis, demographics, medical and developmental history, contact frequency, and assessment service adherence to best\u2010practice standards. Waiting times were calculated, and relationships were analyzed using linear regression. Median waiting times were 525\u2009days (IQR 329\u2013857) for children\/adolescents and 252\u2009days (IQR 106\u2013611) for adults. Only 20% of children's and 47% of adult assessments met the proposed 252\u2010day diagnostic time target. Autism and ADHD were the most common diagnoses. Receiving &gt;\u20091 neurodevelopmental diagnosis on completion was uncommon. Demographic factors did not significantly affect waiting times. Children\/adolescents with more complex developmental and medical histories experienced longer waits (100.3\u2009weeks vs. 67.7\u2009weeks; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), while adults with similar histories had shorter waits (32.7\u2009weeks vs. 57.4\u2009weeks; <jats:italic>p<\/jats:italic>\u2009=\u20090.016). Adults with ADHD experienced longer waits than autistic adults (63.4\u2009weeks vs. 38.6\u2009weeks, <jats:italic>p<\/jats:italic>\u2009=\u20090.002). Adherence to best\u2010practice quality standards was associated with shorter waits for children (\u03b2\u2009=\u20090.27, p\u2009=\u20090.002), but the relationship between standard adherence at different stages and for adults was less clear. More frequent appointments correlated with shorter adult waits (33.7\u2009weeks vs. 59.2\u2009weeks, <jats:italic>p<\/jats:italic>\u2009=\u20090.015). Gender distribution was balanced among adults, but children's services included more boys. 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