my own responsibility

how long should I go to complete my responsibility? Recently we launch a web site (its not my project) still running it's testing periodand. this should be updated every day. at least the main news always should be the current news. yesterday I found that main news is too old. its the softexpo news which has been finished day before yesterday. so I updated the news and that take my 4 hours of my working hour (searching, editing, image uploading, publishing etc). but this is not my job. will my company realise that I only thought for the site not for own work!