Can I mix license durations on the same manager?

I've installed a trial version of Symantec EP and have decided to convert the trial license to a regular subscription. We will be increasing the number of clients over time as the current Norton AV expires.

Can I mix license durations on the same manager? Can I start with five 1-year licenses and later add five/ten 3-year licenses and will the SEP Manager keep all the licenses straight?

Dave M