Help with pip on wrong end!
It looks pretty normal to me, as far as pips go. It can take them a long time from the initial external pip until zipping. They spend that in between time resting (the external pip is hard work) and absorbing their yolks and the blood that's in the veins that run through the membrane. If its still pecking at the shell, isn't peeping in distress or weakly, it'll be okay to go a while longer.
Just keep checking on it. It's worrying though, I've been there more times than I'd like!