Is it because it is too long? I mean I can't read Gurmukhi so what you could do is read the transliteration or if not, what I do is I listen to it while reading it. This way I get the pronunciation correct and it's more faster.
Just have full dhiaan while doing this though.
I listen to mine coz my attention span is not too good these days with my son around. Do half and listen to half. At least your ears will hear it. That is equal to doing it. When you know it off head after continuous listening theb you might find it easier to concentrate when doing it yourself.
Otherwise it is fine to take a break, get up walk around and come back refreshed to continue.