Questions about Continuing Education Credits for LVN

Hello!

I'm a new LVN and I just completed my IV/Blood Withdrawal course. I received my certificate and it says I earned 36 hours of CEC. I remember a while ago attending this job fair with my school and we did these seminars which counted as as CEC hours as well.

My question is, how many hours do we have to do and how often do we have to do them? Also, who do we turn them in to? Do we ever receive notices in the mail letting us know when our hours are due as well as how many we've done? Does it vary by state?

Thank you in advance!

K