Hi Debsday,

Welcome to the IFSQN forums
I would start by generating an audit plan that covers the whole food safety management system including Policies, Procedures, Operations, Hazard Control Plans and Prerequisite Programmes.
From the plan if you have time you could generate a checklist for each audit. Based on the checklist or the extent of operations/procedures you could then estimate a time each audit would take based on previous experience and historical internal audits.
Don't forget there is also a requirement for Inspections as per FSSC 22000 Additional Requirements 2.5.12 PRP Verification.
The following additional requirement applies to ISO 22000:2018 clause 8.8.1:
• The organization shall establish, implement, and maintain routine (e.g., monthly) site inspections/PRP checks to verify that the site (internal and external), production environment and processing equipment are maintained in a suitable condition to ensure food safety. The frequency and content of the site inspections/PRP checks shall be based on risk with defined sampling criteria and linked to the relevant technical specification.
Kind regards,
Tony