How hard should it be to sharpen?

[Angelus1781]

Just curious how hard it should to be sharpen a becker necker. Dulled it pretty good, and it took some time using diamond steel. Is it suppose to be not very easy, or was I doing it wrong? I've put edges on plenty of knives and swords, as well as my own knives I've made. Maybe I'm getting rusty, or dulled it really, really good.