But how can you even acquire 10 wheat to go on the adventure every 30 minutes? You'd have 0 energy left for any of the other tasks (chic, rocks, crafting). I'm maxed on wheat now but by the upgrade, I'll be wiped out!
Considering most players are likely in a similar boat of relying on time to refill energy and maybe a wizarding school or two, it makes no difference whether the adventure is 30 min or 2 hrs. At least with 30 minutes I can do it twice in the morning before I get my day going.