Hi,
Well the service manual does not specify changing this outside tranny filter at all, however, I do tranny fill and drain every 10k and intend to change the filter every 25-30k.
By the way (update): I bought the filter from the dealer (18 bucks or so), and then the next day I go there to ask them to install it and do the drain, and the service advisor tells me that THAT IS NOT FILTER FOR THE ACCORD!!!!!!!!! When I showed him the receipt from the parts department and the printout of schematics you should have seen the look on his face; it should be in the dictionary next to "dumb/confused/helpless."