Thanks for all your answers guys. But here I'd like to say that despite many ideas; still missing the correct amount. Some ppl says it depends on weight, temperature etc. Of course, but it's meaningless to say that as we are all airliners. I do not want to extend the question but you should get it that what I was gonna ask was for normal Standard conditions.
So the some ppl says 35%N1 is normal limit but any source for that amount of thrust?
And here comes the second question; what should be the minimum distance to get closer to another aircraft? Same problem we had; what I ve been told is that it should be 50 m. minimum. (could depend on the types but I ask for same types) And when I ask the source, he told me that's an Air Law rule but I checked for that on Jeppesen Air Law book, not found.
Any idea?