skigglez 20 hours could work. That would re incentivize me to get transport tech. Right now I don't see much of a point. As long as I succeed in attacking my army will be back when I come out of protection. Dropping it to 20 hours would leave me with a little bit of a gap and bring back some of the pucker factor.
Tangent! I do think defensive protection is too low. Especially seeing some the battle reports lately. Of course if you successfully retal you can get almost 40 hours protection. Supposing my maths are correct. You use 14 hours defensive protection to rebuild, hit your retal, then get 24 hours. But I also think the earlier you retal the better chance you have of succeeding. So there's that