Fleet subscription purchased are valid for 2 years, language in GenService supports this policy. Remember subscriptions are first in, first out, and if Auto Renew is setup then the license will be applied automatically on the renewal date. If the Auto Renew is unchecked, you will need to manually renew the license
Fleet> Details>Subscription Tab> Renew Now Button
All fleet licenses purchased are 12 month, annual subscriptions. Remember once a license is applied to a generator it can be changed up to 45 days past the enrollment date. After that period, the license is considered consumed and will not be credited back to the account.