Early Renewal of NIS

If I renew NIS early, how do I ensure that I do not lose the remaining 54 days left on my

existing subscription??  Or will the renewal process automatically add the remaining days

of my old subscrption to my new one??

 

Thank you

If I renew NIS early, how do I ensure that I do not lose the remaining 54 days left on my

existing subscription??  Or will the renewal process automatically add the remaining days

of my old subscrption to my new one??

 

Thank you