4.6.2.3 Downtime, within the main line of the customer plant, (excluding buffer, feeder lines, etc.) shall be charged at US $500 per minute and shall be 5 minutes or greater in duration. Downtime less than 5 minutes may be recorded in a cost recovery but will NOT generate any request for actual payment. For regions utilizing a different charge back rate, see 4.6.2.11. Does not apply to Warranty Cost Recoveries.