The Cisco Meraki Co-Termination licensing model works on the basis of co-termination, which means that for any given organization, regardless of how many licenses were applied or when they were applied, the license expiration date for all licenses claimed to that organization will be exactly the same. This is accomplished by averaging all active licenses together and dividing by the license limit count of devices in the organization.
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For example, suppose an organization had two separate Enterprise AP licenses, one license for 2x APs spanning one year (365 days) and another for 1x AP spanning five years (1,825 days). The co-termination value would be calculated as ((1825*1)+(365*2))/3= 851 days total for all three APs. So assuming all three licenses were applied on the same day, the organization would have a co-term date of 851 days from the start date of the licenses.
If the licenses were not applied at the same time, for example if the five-year license was applied halfway through the one-year license, the co-term calculation will take that into effect. In this case, the calculation would be ((1825*1)+(182*2))/3=730 days total for all three APs.
Note: The organization co-termination date does not depend on the current device count, but rather the license limit. Removing devices from a network or organization will not impact the co-termination date.
https://documentation.meraki.com/General_Administration/Licensing/Meraki_Co-Termination_Licensing_Ov...
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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