Expiration rate

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The expiration rate of a temporary effect describes how fast or slow time progresses for that effect relative to real time.

Ordinarily, the expiration rate of a temporary effect is equivalent to real time – that is, one second of temporary effect duration lasts one actual second – however, there are modifiers that can increase or decrease it. Modifiers that cause a temporary effect to expire x% slower decrease the expiration rate of that effect, thereby making it last longer. Similarly, modifiers that cause it to expire x% more quickly increase its expiration rate, making it last a shorter period of time.

Mechanics

Despite changing the total time that temporary effects last, it does not increase or decrease the duration of that temporary effect. For most characters this difference does not matter, because the main goal is an overall longer or shorter time for the game mechanic. The difference only matters for benefits and/or downsides that only affect expiration rate or duration. For example:

• Vaal skills with duration buffs/auras, like Vaal Molten ShellVaal Molten ShellVaal, Spell, AoE, Duration, Fire, Physical, Guard
  Level: (1-20)
  Cooldown Time: 0.50 sec
  Can Store 1 Use(s)
  Souls Per Use: 50
  Can Store 1 Use(s)
  Soul Gain Prevention: 0 sec
  Cast Time: InstantApplies a buff that raises your armour, and takes some of the damage from hits for you before being depleted. Each second, the skill deals reflected damage to surrounding enemies based on the damage taken by the buff in that second. When the buff is removed, the skill deals reflected damage to enemies around you based on the total damage that was taken by the buff. You cannot have the buff at the same time as any other Guard skill.Per 1% Quality:1Superior1% increased Skill Effect DurationBase duration is 9 seconds
  Buff grants +(25-429) to Armour
  (30-35)% of Damage from Hits is taken from the Buff before your Life or Energy Shield
  Buff can take Damage equal to 30% of your Armour, up to a maximum of 30000
  Reflects (300-9000)% of Damage taken from Buff as Fire Damage each second,
  or when Buff expires or is depleted
  Buff grants (20-29)% more Armour
  Modifiers to Skill Effect Duration also apply to this Skill's Soul Gain Prevention
  CorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. and Vaal GraceVaal GraceAura, Vaal, Spell, AoE, Duration
  Level: (1-20)
  Cooldown Time: 0.50 sec
  Can Store 1 Use(s)
  Souls Per Use: 50
  Can Store 1 Use(s)
  Cast Time: Instant
  Radius: 36Requires Level 24Casts a temporary aura that grants you and your allies the ability to dodge attacks and spells.Per 1% Quality:1Superior2% increased Area of Effect(24-34)% Chance to Dodge Attack Hits
  (24-34)% Chance to Dodge Spell Hits
  Base duration is 6 seconds
  Modifiers to Buff Duration also apply to this Skill's Soul Gain Prevention
  +(0-19) to radius
  CorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. will gain soul gain prevention time from Increased Duration modifiers, but not from those that affect expiration rate. Therefore having these skills expire slower on you will result in them being active more often than increased duration would.

Temporary effects that can possibly be affected by expiration rate include buffs, debuffs, curses, flasks, and temporary auras. Temporary effects that are not affected by expiration rate include rage and focus.

Sources of expiration rate

Gems

• Temporal ChainsTemporal ChainsSpell, AoE, Duration, Curse, Hex
  Level: (1-20)
  Cost: (16-33) Mana
  Cast Time: 0.50 sec
  Radius: 22Requires Level 24Curses all enemies in an area, lowering their action speed and making other effects on them expire more slowly.Per 1% Quality:1Superior2Anomalous3Divergent0.5% increased Effect of CurseCurse has 2% increased Doom gain rate1% increased Curse DurationBase duration is (5-5.95) seconds
  Cursed Normal and Magic Enemies have (20-29)% less Action Speed
  Other effects on Cursed enemies expire 40% slower
  50% less Effect of Curse against Players
  Cursed Rare and Unique Enemies have (10-14)% less Action Speed
  Curse gains 10 Doom per second if you Cast this Spell yourself
  +(0-10) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

• phantasm alternative quality HasteHasteAura, Spell, AoE
  Level: (1-20)
  Reservation: 50% Mana
  Cooldown Time: 1.20 sec
  Can Store 1 Use(s)
  Cast Time: Instant
  Radius: 36Requires Level 24Casts an aura that increases the movement speed, attack speed and cast speed of you and your allies.Per 1% Quality:1Superior2Anomalous3Divergent4Phantasmal2% increased Area of EffectYou and nearby Allies have 0.5% increased Totem Placement speedYou and nearby Allies have 0.2% increased Projectile SpeedBuffs on You and nearby Allies expire 0.25% fasterYou and nearby allies gain (9-16)% increased Attack Speed
  You and nearby allies gain (9-16)% increased Cast Speed
  You and nearby allies gain (4-9)% increased Movement Speed
  +(0-19) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Buffs

• Shaper's Presence

• Rupture

Ultimatum league introduced a trials of chaos. These trials can have an option that makes buffs expire three times faster. This does not affect all temporary effects listed above, only buffs.

Items

• Watcher's EyeWatcher's Eye
  Prismatic JewelLimited to: 1(4-6)% increased maximum Energy Shield
  (4-6)% increased maximum Life
  (4-6)% increased maximum Mana
  <Two or Three random aura modifiers>One by one, they stood their ground against a creature
  they had no hope of understanding, let alone defeating,
  and one by one, they became a part of it.Place into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket. grants Modifier:HasteDebuffsExpireFaster
• The Flow UntetheredThe Flow Untethered
  Cloth BeltRequires Level 60(15-25)% increased Stun and Block RecoveryGrants Summon Harbinger of Time Skill
  (10-15)% increased Attack and Cast Speed
  (15-20)% increased Energy Shield Recovery rate
  (15-20)% increased Life Recovery rate
  (15-20)% increased Cooldown Recovery Rate
  Debuffs on you expire (15-20)% faster
  
  and The Torrent's ReclamationThe Torrent's Reclamation
  Cloth BeltRequires Level 60(15-25)% increased Stun and Block RecoveryGrants Summon Greater Harbinger of Time Skill
  (10-15)% increased Attack and Cast Speed
  (15-20)% increased Energy Shield Recovery rate
  (15-20)% increased Life Recovery rate
  (15-20)% increased Cooldown Recovery Rate
  Debuffs on you expire (15-20)% faster
  
  grants Modifier:DebuffTimePassedUnique~~1