A line graph shows average sentence length and gun enhancement time added (in years) for individuals admitted to prison in California with a gun enhancement by SB 620 status for conviction years 2014–2025. A vertical red dashed line indicates when SB 620 took effect at the beginning of 2018. The graph tracks four data points: Total sentence length (SB 620) (solid dark blue line): This represents the highest values, starting at 34 years in 2014, peaking at approximately 33 years in 2018, then dropping to a low of about 22.5 years in 2021 before rising again to nearly 29 years by 2025. Total sentence length (non SB 620) (solid orange line): Fluctuates between 10.5 and 18 years, showing a general upward trend after 2019. Average enhancement length (SB 620) (dashed dark blue line): Starts at roughly 13.5 years in 2014 and gradually declines to approximately 10 years by 2025. Average enhancement length (non SB 620) (dashed orange line): Remains the lowest and most stable metric, staying consistently between 2 and 4 years throughout the period.