I don't have the time to read all 3 pages of posts, but I wanted to throw in my 2 cents.
It's absolutely asinine to say, at this point, that this 1-hour time limit is a "cop-out" method to make Algalon harder. Wait until you fight him and he eats your tear-ducts dry before assuming that.
Like many have undoubtedly said, its most likely to remove the "banging your head against a brick wall" strategy. I.E. you simply get a group with nothing but time and slam your head into the encounter for hours every day until you get him. This is gonna make it so people have to actually plan ahead, think about what they're gonna do and execute it properly.
As far as the comments that said you would be left with nothing to do...maybe its time for you to pack it in, because there is so much more to this game than raiding, if that's your stance on it, that's pretty sad, imo.
Lastly, I'm pretty sure it will be a system where he will despawn 1 hour after being engaged the first time, including all time spent running back from wipes, rebuffing etc.
Just my 2c.