For the extreme long term, you’ll get the best efficiency if you wait years between practice sessions, but that won’t help you in the short term at all. Moreover, your practice sessions would be extremely frustrating. After such a long delay, you’d have forgotten almost everything. On the other hand, if you practiced all the time, you’d be able to remember almost everything, but your old words would come back so often that they would bury you in hours of daily work.
