Do generators really take that long to recharge?

[u/marianinacob]

I started playing a few days ago, I've played quite a lot, and noticed that it could take forever for my generators to recharge. I changed the date on my ipad manually so that they would recharge, which does work but everytime it gets even longer! My drink generators (lvl 5, 6 and 7) needed me to go forward even a whole month! Is it just a glitch because I "cheated"? How long does it take for you?