Spellbound, also known as Augment Maintenance, Defense Maintenance, Buff Duration, Buff: Duration, and Soul Voice, is an ability or effect that increases the time status effects last.
Spellbound is an augment that costs 30 LP to learn, and it increases the duration of all positive status effects by 50%.
The Synergist passive ability Boon increases a character's buffs' duration when a Synergist spell is performed on the character. The inverse happens with the Saboteur role ability Jinx, which increases the duration of an enemy's status ailments when a Saboteur spell is cast on the enemy.
Hope Estheim's Vidofnir and Sazh Katzroy's Spica Defenders weapons have the Defense Maintenance and Augment Maintenance abilities, respectively, which further increase the duration of buffs in those groups. These weapons are also able to provide the Buff Duration synthesis.
The Synergist again naturally boosts durations due to their role bonus and Boon. Serah Farron and Noel Kreiss are able to equip the synthesis abilities "Buff Duration" and "Buff: Duration"; one affects buffs cast by the user while the other affects buffs cast onto the user.
Some Synergist monsters learn Defensive and Augment Maintenance as passives, and/or the command Endless Blessings. Saboteur monsters can again learn Jinx, and some may learn Endless Nightmares.
Spellbound is a status effect that increases the time of effect of all status, may them be positive or negative. It is inflicted by the Time Mage's Extend spell and by the Spellbound Support Ability, available to viera Green Mages and nu mou Scholars.