I have been on TH 10 for about 3 weeks now. My base defense was maxed for TH9.

Finding resources has been very hard (and i play this game alot), i have been in crystal 1 and down to sub 200 trophies. I have manged to get both inferno towers, new cannon to level 11, new archer tower to level 10 and new level 1 xbow.

I have only been able to save for one mortar upgrade which has been completed and nearly saved for my next. All my builder are out of work and that never happened with TH9.

My idea is the ability to increase the build time, and reduce the cost.

Example
Mortar to level 8 cost 6,400,000 G and takes 10 days. So that is 640,000 G for each day.
So if the build time was increased to 12 days the cost of the upgrade would change to 5,120,000 G

The maximum upgrade time can only be increased by 4 days, and is only applicable to anything that needs a builder and is available from TH8 upwards