I don't have any personal knowledge of this, but I would say that this is a very good start. It should be at the training level that you start the education, but it's soon forgotten. Therefore, it's something that has to be repeated many times. Once a year could be fine. That's what my recommendation would be. It would be that there always be amendments made to the internal policy on sexual harassment or violence at work, whichever form that it wants to take, that there be a committee that works on it to see if it's working and that is watching, because people tend to forget.
We meet a lot of people who don't even know if their company has a policy. Usually when they are hired, they get a copy of it, but they're just so happy that they got the job, that it's filed away and they forget to look at it again.