I guess that the Challenge event is only intensive if you compete. If you don’t, you just take your completion prizes in the first hours and then you have 3 and a half days to do whatever you want. Like farming rare 3 for 1 World energy and the xp…oh wait…
The Masquerade quest can also be done within several hours, provided you reserved some WE for it…or you can just wait, rest, relax for day and a half and then complete it 12 hours before it ends.
Same with the Tavern of legends.
So I don’t find these events to be that much real-life time consuming for the experienced players. Also the easier stages can be put on autoplay.
I guess if you’re experienced enough and know your drill, the Ninja tower also could require only several hours, or let’s say 1 hour each of the four days it’s running to complete entirely.
It’s only natural for E&P to stack events like this to compete with other games of its genre, nothing unusual there.
IMHO in the end important thing is what you value more and what you have more. If one has lots of free cash but little free time, then that person is best suited to pull with gems, skipping most of the events. Then of course comes the question of why such a person is playing when they don’t have the time…If one has lots of free time and limited cash, then the stacking of events should be even more welcome to them. If a person has neither…well…then I suggest they take it as casual as possible and don’t try to complete everything, just participate in what’s currently up and running I guess…