This thread has the right idea.
The best way is to have the full circle of 8 lvl 10 npcs around your city. And 3 npc 10s at exactly 2 miles away.
So 11 lvl10 npc's total.
Do a big circle, hit them with 94k arch 6k scout. then hit the 3 at 2 miles out. A FULL loop on all 11 npc's will take about 1 hour 4 minutes. Do this over and over nonstop, it gives you 20mil exp per hour on your hero. Do it for 16 hours = 320mil exp in 1 day.
If you can afford the troops... it is killer exp.
This is how I built my archer tower hero and many of my attack heroes. It is exp so fast you don't know what hit you

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