So, Azir can place a Sun Disc on destroyed tower bases, but Is there a cooldown for when you can place another one on the same tower base?
Is there a cooldown on the ability?
If so can you lower it some how? Thanks for the help in advance. 
Virgin Ray1 votesWhen it's off CD you can place your turret anywhere regardless of if you used that spot from the last turret. As long as it's not the enemy nexus and inhib turrets, because you cannot place turrets there.
IsaacFlame41 votesWhat's the cooldown timer?
Virgin Ray1 votes180 seconds aka 3 minutes after turret dies.
IsaacFlame41 votesSo, does that mean you could place two towers in quick succession?
1 800 MID LANE1 votesNo. One at a time, 3 minutes apart. I think CDR has an effect on it, but I've never actually paid any attention. I just used it when possible/when I saw fit. Sometimes only once per game as it DOES give gold to the enemy that kills it.
IsaacFlame41 votesDoes it have as much health and armor (When Azir is close) as a traditional tower?
1 800 MID LANE1 votesIt has significantly lower defensive properties that remain consistent regardless of where Azir is on the map and does slightly less damage as the damage from this turret doesn't have the bonuses to offensive stats.
EDIT: I believe that using it in your own base allows for more health, but I'm not entirely sure.
IsaacFlame41 votesDoes it disappear after some time? Or does is it stay there until it gets destroyed?
Virgin Ray1 votesIt's HP slowly grinds down in a minute. If goes away it losses so much armor it even falls to minions.
IsaacFlame41 votesDoes the cooldown start immediately after the disc is summoned?
Virgin Ray1 votesafter the disk dies.
So could you place two if you were quick? And if you summon a disc on one of your own nexus tower bases does it make the nexus untrargetable?