Although it is difficult to come up with a fixed or narrow range time frame to run due diligence, I would think that approaching the time frame from a coverage perspective would be meaningful especially given the risk that more risk might emerge over a longer due diligence time frame. When the company is able to cover all the different aspects of due diligence (Tax, legal, HR etc), it would probably be a right time to make a decision on whether to proceed with the M&A activity.
