Mobs seem to have an individual chase radius within which it will follow a targeted player indefinitely. If the player runs beyond this radius, the mob will run along some path. The path itself is hazy to me, it might be as if the creature were feared, it might be a path that leads to its spawn location, or it might resume its predermined patrolling path. I want to say the likely case is the fear pathing as it always seemed to be in the exact opposite direction from myself. In any case, the mob is running, and yelling for help the whole time (just like when you've got it engaged).
While running home, other NPCs can be alerted of the player and target them as well. They will even give chase if the player is within their particular range. If not, they will usually just continue their current action of standing still or patrolling until either they forget the player or the player comes within their chase range.
Mobs seem to attempt to reset themselves every 5 or 7.5 minutes after being engaged. If the player is still within their chase range, they will continue to give chase indefinitely. If none of their targets is within their chase range, they'll probably reset themselves and lose aggro. I wouldn't really implement this until after some lengthy discussions on in which instances the reset will succeed.
Mobs also seem to reset themselves (hp, etc) completely once arriving at their spawn point, if they're static, so it may not take as long. Roaming mobs tend to just resume their roaming after aggro is wiped. They might reset at their spawn points, too, but such a thing occurs so infrequently it's not readily observed.
The only ways I recall to force an aggro wipe are as follows:
zone (zone, camp, die, etc), feign death, memory blur, fading memories (and similar skills, e.g. escape), get far, far away and let everything cool down for about 10 minutes.
The latter of methods being difficult for anyone that runs slower than a Bard, mind you, with most zones not being large enough to pull enough distance with only a minor difference in speed.
Being invis has no bearing on mob behavior, they can always find you if you're on their hatelist, visible or not. Tired of rambling, some others can finish hashing it all out.
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