How much grind for STAR Camo/2.0 Perm? Tips and Tricks?

So I don't know if this has been asked already but how much grinding does one have to do to obtain Perm STAR Camo/2.0? Also does the difficulty matter?

I've been sitting in Shattered Station [Hard] rooms repeating the same thing over and over again and I don't really mind it (I've played BF4 on Op Lock/Metro 24/7 for a LONG time and I'd still dump another 500hrs into Op Lock or Metro only servers) but it'd be nice if I had a better idea of what I should be aiming for other than "dur I'm gon git er done till I get reward".

I've heard some say its more common on Normal and this and that, is it really true? Are the legends real? Or do I have to throw my mind into a box and grind it till RNGeezus hears my prayers. Will offering a sacrifice to our Dark Lord Satan increase my chances? No but seriously, are there any tips and tricks besides what I'm doing right now.

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