Many people forget that CS salaries are typically lower than pte. Assuming similiar role and responsibilities, If CS earns $750/mth then in pte this could well be $1,000/mth. Hence....

$750 x 15.8 months = $11,850

$1000 x 14.5 months = $14,500
$14,500 / $750 = 19 months

Its easy to see that 15.8 months may seem alot compared to pte 14.5 - 15 but at the end of the day CS still earn less. Perhaps thats what the prev poster mean, regardless of industry