Last year I began a first full year of teaching 5 minutes a week of Hebrew at Sunday School. You would have to ask the students how successful it was but if you look at page 26 (here) of my 'new book' אָלֶף-בֵּית עִבְרִי on the alef-bet you will find 34 questions and I know there is one 11-year-old student who can answer most of them and many others who would have no trouble with some of them. That's not a bad result for an experimental class. Links to the rest of the book in pieces can be found on the St Barnabas Sunday School blog here. I will resume weekly posting sometime around mid-September.