Translation of "virtual machine expiration" into Portuguese

A feature of Virtual Machine Manager that enables an administrator to set the number of days after the created date when a virtual machine is retired from use by self-service users. Expired virtual machines no longer appear in the Virtual Machine Manager Self-Service Portal. However, the Virtual Machine Manager administrator still can manage the expired virtual machines. Expiration settings are applied transparently through the virtual machine templates with which self-service users create their virtual machines.