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I split my builders between structure type: 2 builders on ATs and Cannons, 1 on AD, 1 on Tesla, and 1 on Mortars and Wiz towers. Since TH8 you need to do ATs and Cannons to level 9 AND 10 the combined time it took to do all of those was equal to the time it took to do the ADs, Mortars and Wiz Towers at 2 @ 1 builders, respectively. By the time you get done with the ATs and Cannons you can move the builders onto the remaining Wiz Towers, if need be, or move them onto the Teslas, which is your largest chunk.
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WOW! i had no idea they were so expensive, seeing as i have 2 builders busy atm, i'll get the other three working on me teslas tonight, thanks to everyone for your help ^_^