Unfortunately no, there is no way to limit per hour natively in Meraki. You need a third-party solution.
Unless you are using Billing, then it is possible.
https://documentation.meraki.com/MR/MR_Splash_Page/Billing_for_Wireless_Access#Determining_a_Pricing...
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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