You are not wasting an editors time if you submit one more time a year later
You are wasting an editors time if you resubmit over and over again to the same or multiple categories
So should be no worry there.
Since the ODP never guaranteed any sites inclusion, nor a time frame for a review and the prevailing advice from those in the the know is "Suggest and forget" when it comes to dmoz, you cannot possibly be waisting your own time either. It only takes a few minutes to read the guidelines, find a suitable category and write a description afterall. That is unless you are counting on a dmoz listing as being a magic bullet that rings your checking account instantly, so you start obsessing about getting a listing and forget to manage your site for your customers. Then you are not only waisting your time, but also extremely mis-guided.
Bottom line: You have suggested your site (twice it would seem) and there is nothing more that needs to be done. You have done all you can to help an editor find it. There is no way to predict how long it will be until an interested editor finds the suggestion and there is no way to speed the process along any more than you already have. You did good. Now just concentrate on your site-adding content and usefulness for your customers and you may just find you do really well on your own
Hope that helps.
