Implementing integrated management systems

Answer: Considering the number of people you stated, an implementation, including the certification process, usually takes between six and eight months. Since you are thinking about implementing multiple standards, the implementation may vary, but you can take advantage of the similar structure of ISO standards to save some time and money implementing common requirements, like planning, internal audit and management review.

The maintenance process is an ongoing process that will last until the organization decides it does not want the certifications any more. The certification cycle is three years for all standards you mentioned.

Most of the outsourced activities your organization has will be handled by contractual clauses.

These articles will provide you further explanation about implementing the standards:
- How long doe s it take to implement ISO 27001 / BS 25999? https://advisera.com/27001academy/blog/2011/11/08/how-long-does-it-take-to-implement-iso-27001-bs-25999/
- How long does it take to implement an ISO 9001-based QMS? https://advisera.com/9001academy/blog/2016/07/05/how-long-does-it-take-to-implement-an-iso-9001-based-qms/
- How long does it take to implement ISO 14001:2015? https://advisera.com/14001academy/blog/2016/04/04/how-long-does-it-take-to-implement-iso-140012015/
- How long should it take to implement OHSAS 18001? https://advisera.com/18001academy/blog/2017/01/18/how-long-should-it-take-to-implement-ohsas-18001/
- How to implement integrated management systems https://advisera.com/articles/how-to-implement-integrated-management-systems/

This material will also help you regarding ISO implementation:
- Preparations for the ISO Implementation Project: A Plain English Guide https://advisera.com/books/preparations-for-the-iso-implementation-project-a-plain-english-guide/