What Is the Length of a Typical M&A Integration?

"There is no norm, no typical length. Depends on the company, complexity, (the operating and cultural differences between companies, the time people dedicate to the integration, their integration experience and expertise, the changes to IT systems, the scope and goals) ... but you should operate with urgency to get a lot accomplished in the first 4 or 5 months after close. The long tail integration activities will usually go on longer than that ..."