I know there's a late fee on renewals but is there a time limit?

On license renewals no on registration yes once expired your in violation with the law/police

thank you I was inquiring about license renewals I'm late since Oct.2017 I've been dealing with an illness didn't need to drive than forgot I don't mind late fees just don't want to take test again..

No. If your driving on an expired registration then your in violation .