Coming from someone who camps 16+ hours daily I do have to agree with aileron, shorter spawn times do motivate people to log more, these long windows definitely is a little over board, also then reducing minimum spawn time creates more work for the very little who do camp. Camping hours on end can be a burden sometimes cause you aren't just worrying about one boss your worrying about 6 or so bosses, then when raids due your worrying about 10 or so bosses, it's hard for the very few who camps to keep up and once it becomes to much of a burden they tend to quit
Alternatively, instead of trying to win everything, you could focus on one thing at a time? Or, God almighty forbid, the people who want blood rings just might have to volunteer some time camping Necro.
Or maybe I'll just force you to camp stuff. Actually nevermind, because then you might have an actual reason to be upset with camping.