Reference for Ketubot 219:13

תנן וחכ"א זה גובה וזה גובה תרגמה רב נחמן אליבא דרב ששת כגון שלוה זה לעשר וזה לחמש

We have learned: The sages say: The one recovers his debt and the other recovers his debt. Nahman explained this according to R. Sheshet, [as referring to a case,] for instance, where one borrowed for a period of ten years, and the other for one of five years.

Jastrow