In Chulin 32a, there is an argument between Tana Kama and Rabbi Shimon regarding what happens if you break in the middle of Shechita. If the break is too long, the Shechita is Pasul. According to Tana Kama, you cannot break more than "Kedei Shechita." According to Rabbi Shimon, it's "Kedei Bikur." Which is longer?