Talk:Cumulative Costs/Home Village/@comment-25830032-20141207220146/@comment-2170536-20141208141631

The total at the bottom is all upgrades considered together regardless of Town Hall level, not a simple sum of the individual Town Hall levels. In the cases where there is a bottleneck in the laboratory you could consider that it is assumed that the player goes ahead and upgrades the Town Hall rather than allow the builders to remain idle.

It is also the reason that there is only 1 day difference between 3 huts and 4. With 3 builders, all upgrades from TH1 to TH10 will take almost 594 days. Four builders would take substantially less time (probably around 448 days), but there are also nearly 593 days' worth of laboratory upgrades (including the laboratory itself). So beyond 3 builders the total overall time won't decrease because they cannot speed up the laboratory time.