Norton Antivirus and buying Norton Security Premium

Greetings all.

I have been a Norton Antivirus user as long as I can remember. I currently have it installed on 2 home PCs. I have never experienced any problems except the usual 'lost days' on installing new NAV via a shop purchased product (boxed DVD/CD). This always rectified via the recommended online chat.

I have about 60 days left on my current subscriptions.

Question. I received an offer from Norton via email - Boxing Day Sale: Save 70% Off Norton Security. Thank you.

In considering a changeover from Norton Antivirus to Norton™ Security Premium, will I loose those 60 days on the Norton Antivirus if I purchase/install the new software?
Thank you in advance.