The 24 hours is dictated by new Big Sur EULA.
https://9to5mac.com/2020/11/11/macos-big-sur-adds-leasing-te...
From the new EULA (not just for Amazon, paraphrased by 9to5mac):
* Apple software and hardware must be leased “in its entirety to and individual or organization”
* A lease period must be “for a minimum period of twenty-four (24) consecutive hours”
* Customers must now accept software agreements for all installed software of leased hardware
* All of these changes are only offered for “Permitted Developer services,” which are now spelled out for users
* Developers may now “install, use, and run additional copies or instances of the Apple Software within virtual operating system environments”
* The “lessor” such as Macstadium is fully responsible for making sure that all of these new requirements are upheld
https://9to5mac.com/2020/11/11/macos-big-sur-adds-leasing-te...
From the new EULA (not just for Amazon, paraphrased by 9to5mac):
* Apple software and hardware must be leased “in its entirety to and individual or organization”
* A lease period must be “for a minimum period of twenty-four (24) consecutive hours”
* Customers must now accept software agreements for all installed software of leased hardware
* All of these changes are only offered for “Permitted Developer services,” which are now spelled out for users
* Developers may now “install, use, and run additional copies or instances of the Apple Software within virtual operating system environments”
* The “lessor” such as Macstadium is fully responsible for making sure that all of these new requirements are upheld