Non-SaaS - Benchmark/Case study data on time to ROI

veronique-montreuil

Does anyone have case studies or data that showcases time to ROI for any Customer Success initiatives or changes made to drive better results? 

In my non-SaaS technology industry, we get varied delays to start seeing improved results after deploying initiatives and changes.
For example: the more complex the solution deployed, the bigger the customer, the longer in advance their strategic decisions can be made that would result in churn. Churn we experience today in a top customer segment can have been decided 12+ months ago.

Is there data out there that can help highlight and plan for that delay? 
Anything that supports moving from anecdotal data would help.

Thanks!