Final answer:
VMware's ESXi hypervisor offers a full-featured evaluation mode that lasts for 60 days.
Step-by-step explanation:
ESXi, a type of hypervisor provided by VMware for virtualization, allows users to try its features in evaluation mode. This free trial period offers full functionality of the ESXi hypervisor. The length of the trial is 60 days, after which the user must provide a valid license key to continue using ESXi with its full capabilities.