How long will it take me? About 10-12 weeks on average, if you follow the tailor made Pre-Audit Action check list we provide. Our e-Book explains more. FAQS How Does Your Service Work? How long will it take me? How much work will I have to do? Will I have to employ another person to help maintain this? What can I expect during an audit? ISO 27001 Timeline Combined ISO9001, ISO45001 and ISO14001 Timeline