OK. And how long it takes for a DNA composition to melt up to 80% into a certain group ? 500 years? 1000, 10 thousands..?In this case I find it irrelevant to know that my Y DNA originate to 60 thousands years ago in Asia.... 23andme provide only hg C and no subclade which leaves it more ambiguous and vague. Is there a way to map my DNA composition in a more detailed way ? so I can track back my ancestors since the out of Africa all the way down to few hundreds years ago ?
I'm pretty sure that your Y DNA and mtDNA is not included in your ancestry calculation, because they could be very misleading. They could be very foreign, coming with emigrants to your area, and it could persist, because they don't mix, for thousands of years in a population. Your Y hg C is the best example of it. Having said that it could have arrived in your area tens of thousands of years ago, way before E1b1 did. We just don't know at the moment without deeper subclades.
Autosomal DNA is 98% of your all DNA and comes from both your parents, and generations of your ancestors, on both side of your parents. You have 50/50 of DNA from mother and father. 25/25/25/25, a quarter from each grandparent. Gowing earlier, 1/8th from each great grandparent. By 7th generation, it DNA goes down to less than 1% from each contributor. By 7 generation, everybody has 128 ancestors contributing to own aDNA. 7 generations that's roughly 175 years (25 years per generation), and every single ancestor becomes less and less relevant to the big picture.
For example, this 0.2% of middle eastern of yours, could have come from your Great x6 grandfather who came from Turkey 200 years ago. Interesting thing is that after 200-300 years, the proportions of single ancestors, are so small that it might be deleted permanently from your DNA, depending how parents DNA combine together. It is never perfectly 50/50.
In this light, what is relevant to aDNA, is how it fits into bigger picture of local population. In your case 85% looks exactly native to the area, like most of people there. This can mean that one of your great grandparents was almost 100% European and 7 great grandparents were 100% (or almost) North Africans. This could have given you your ancestral mix of 10% European and 85% North African.
Or 2 of your great great grandparents were Europeans and 14 North Africans.
This could also mean that perhaps in your area of Algeria everybody has your admixture proportions, European part coming in historical times from Romans, Vandals, Spanish and French. Therefore all your autosomal DNA comes from local stock, granted that most Algerians of your area have 10% European admixture. You have to compare your ancestral proportion to other Algerians to know which scenario is closer to the truth.