ummm....perhaps the long upgrade time is due to an effort to again "stimulate" coining rather than earning improvements? After all, the changes were likely prompted by the crying/whining of the heavy coiners so that they can again gain an advantage in base hitting (coin it and gain 1-2 months advantage at a minimum). New turret weapon? So what, there remains a limit on how many turrets CAN hold the new weapon. It's not an additional weapon, it's a replacement for something already in use. Nothing new from Kixeye here.
With a fully upgraded base with all available buffs to upgrades they're actually less than 8 days each.