I’m not sure what raids where like on the game your referring to, but msf raids aren’t that time consuming. Your limited on energy, so 5 battles is the max you can do at a time (without using resources). It only takes a few minutes, usually twice a day. A lot less than running my 15-20 troopers.

Anyway, this is way off topic, so I’ll add that I don’t really care for this dungeon event. The rewards don’t seem worth the effort.