All at once
One at a time
One at a time One dark barrack at a time as well. I was having 9/6/6/6 then I starting upgrading 1 barrack one by one for god knows how long, and now my barracks are 10/10/10/9(upgrading) And one dark barrack upgrading as well. So I'm running barb/arch/wb/minion combo to reduce the pain. And frankly speaking, it really helps in making you appreciate the 4th barrack, or even 5th,6th if you know how to utilise them. Once I have all 6 barracks fully operational, you are going to see me raiding every 15 mins without barrack boost But.. if you are going on a holiday, then just do all at once, really
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Matter of opinion really. If you have to go on a break then do all apart from one at once. Log on (if you can) once or twice a day to collect from collectors and mines and to donate.
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Upgrade your barracks when your on holiday or not going to be active
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