Cross reference
Leviticus 25:16
16 If the number of years is great, the price will be increased, and if the number of years is small, the price will be less, for it is the produce of a certain number of years which the man is giving you.
Leviticus 25:27
27 Then let him take into account the years from the time when he gave it up, and make up the loss for the rest of the years to him who took it, and so get back his property.
Leviticus 25:51
51 If there is still a long time, he will give back, on account of it, a part of the price which was given for him.