Can anyone be online 24/7 to protect their Resources?

As nobody can attack players while they're online, some smart users might think of ways to protect their Resources forever. In order to avoid such situations, you will become vulnerable to attacks after being online for 5 hours. After hour 5, any player will be able to attack your Base regardless of what you're doing in the game for one hour. During that hour, you should avoid doing anything important in-game because other players' attacks may interfere!