Faster build/upgrade time.

I'm not sure if this has already been suggested, but my idea is that you can decrease your build or building-upgrade time by adding a builder to the process.
For example, upgrading to a level 7 town hall takes 6 days. This feature allows you to add one (or more) builders to the upgrade process to speed up the time.
Obviously not cutting the time by half, but maybe by a percentage, and more builders would increase the percentage.
Normal time - 6 days
Builders -
+1=15%
+2=+5%(20% total)
+3=+5%(25% total)
+4=+2.5%(27.5% total)
(just some rough numbers)

So yeah, that's just my suggestion, it's a benefit to those who purchased the builders, and to Supercell.

Heyo~ and welcome to the forums! (^w^)/

Unfotunately, the idea of stacking builders on one building to speed up the upgrade time has been ruled out by Supercell. The full list of ruled out ideas is available in the link in my sig; please take a look at that before posting another idea thread. Thanks, and clash on!:o