Global Order Cycle Settings control a few simple items on how order cycles are calculated.
It is accessible by going to Admin --> System Configuration --> Order Cycles
Min Cycle Length - For any dynamic order cycle calculations, such as EOQ- or Minimum-based, this sets a floor on how short this auto-calculated cycle is allowed to be.
MaxCycle Length - For any dynamic order cycle calculations, such as EOQ- or Minimum-based, this sets a ceiling (max) on how long this auto-calculated cycle is allowed to be.