Re-calibration time

How often you perform external or internal calibrations and whether you need to perform intermediate checks (verifications), and how often; depends on the process steps and what equipment is used. 
No auditor can dictate the period or specific day when calibrations and verification must take place, unless there is a requirement in your proceure, in the method or from a regulatory body. For example, for analytical balances it is straight forward – a laboratory would use a set of weights that they own, where each piece has metrological traceability to SI, where they were previously calibrated by an external calibration provider (at a suitable frequency, based on risk and need).  So here you have reported uncertainties on the calibration certificate that you confirm are acceptable for each piece. Then you perform intermediate checks (verifications) on your balances at suitable time intervals (also based on risk), across the range of use (g) of the balance. For balance, this is typically daily.

For further information have a look at the ILAC G24:2007 Guidelines for the determination of calibration intervals of measuring instruments (note currently under revision) available for download at https://ilac.org/?ddownload=818

These may also be of interest 

• Response to another Expert Advice Community Question, Are intermediate checks required for calibration laboratories? at https://community.advisera.com/topic/are-intermediate-checks-required-for-calibration-laboratories/
• The article What does ISO 17025:2017 require for laboratory measurement equipment and related procedures? at https://advisera.com/17025academy/blog/2019/07/25/iso-17025-measurement-requirements-of-the-standard/
• The ISO 17025 document template: Equipment and Calibration Procedure at https://advisera.com/17025academy/documentation/equipment-and-calibration-procedure//