In Shin Megami Tensei III: Nocturne, the buff is permanent and can stack up to 4 ranks. The attack debuff and the attack buff (Rakukaja) are separate variables, so although they stack with one-another and can neutralize each-other's effects, they still can only be used 4 times each unless one of the stats is reset with Dekunda or Dekaja.
In Shin Megami Tensei IV, Rakunda lowers the enemy faction's defense by 1 rank, and stacks up to 3 ranks. Each rank lowers the user's defense by 20%, with the minimum reaching 60%. It stacks multiplicatively with other buffs, Tarukaja included. (1.6*1.6=2.56)[1] The buff and debuff statuses are singular, rather than individual, so if the target's attack is increased by 1 or more stages, Rakunda will directly decrease it without the need of Dekaja.
In Shin Megami Tensei V, Rakunda decreases the Defense of one enemy by one stage for 3 turns. Debuffing again will have it stack to 2 ranks max, and debuffing each time resets the timer of the debuff. On the first rank, the damage the user takes is increased by x1.2,[2] while on the second rank, it's x1.4. The effect stacks with other buffs via multiplication.
In Soul Hackers 2, Rakunda lowers the defense of all enemies. The effect doesn't stack in ranks, and normally lasts 3 turns, but it can be extended to 4 or 5 with Mistiques.[3] Casting the skill again will replenish the timer. The effect icon will begin blinking faintly the turn before the skill wears off.
In Persona 3, Persona 4 and Persona 5, Rakunda lasts for three turns:
In Persona 3 and Persona 4, the damage taken by affected enemies is increased by x1.5. If stacked with Tarukaja on the attacker, the damage is doubled (50%+50%).
In Persona 5, the damage dealt is increased by x1.4.[4] It most likely stacks multiplicatively with Rakunda, granting a result of 49/100. Casting the same skill again will extend the timer by 3 additional turns, up to a maximum of 15. Rakukaja directly cancels out the user's defense debuff, regardless of the remaining duration.
In Persona 5 Strikers, Rakunda lasts for a certain period of time. Under default circumstances, it lasts 50 seconds.