ויקרא כה:נב פירוש: ספורנו

ואם מעט נשאר, so that the years of “good” labour rendered have already given the employer value for the money he had originally paid, allowance is made for the number of actual years which were not completed in the original contract. This is what our sages call: נתמעט כספו, כפי שניו, (Kidushin 20)