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 (or expire x% faster) increase its expiration rate, making it last a shorter period of time. The modifier expire x% faster is a system of diminishing returns and the modifier expire x% slower is a system of increasing returns (see Expiration Rate Formula).

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 ShellSpell, AoE, Duration, Fire, Physical, Vaal, 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: 14 sec
  Cast Time: InstantRequires Level 4Applies 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.Base duration is 9.00 seconds
  Modifiers to Skill Effect Duration also apply to this Skill's Soul Gain Prevention
  Buff grants +(50-858) to Armour
  (35-39)% of Damage from Hits is taken from the Buff before your Life or Energy Shield
  Buff can take Damage equal to 20% of your Armour, up to a maximum of 10000
  Reflects (300-9000)% of Damage taken from Buff as Fire Damage each second,
  or when Buff expires or is depleted
  
  Additional Effects From 1-20% Quality:
  (1-20)% increased Skill Effect DurationCorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. and Vaal GraceVaal GraceAura, Spell, AoE, Duration, Vaal
  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: 9 sec
  Cast Time: Instant
  AoE Radius: 36Requires Level 24Casts a temporary aura that grants you and your allies additional chance to evade attacks, and makes suppressed spell damage unlucky against you.Base duration is 6.00 seconds
  Modifiers to Buff Duration also apply to this Skill's Soul Gain Prevention
  +(0-1.9) metres to radius
  You and nearby allies have +15% chance to Evade Attack Hits
  Suppressed Spell Damage dealt to you is Unlucky
  
  Additional Effects From 1-20% Quality:
  (2-40)% increased Area of EffectCorruptedPlace 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, flask effects, and temporary auras. Temporary effects that are not affected by expiration rate include rage and focus.

Expiration Rate Formula

The Expiration Rate is calculated as followed:

$\color [rgb]{0.6392156862745098,0.5529411764705883,0.42745098039215684}y(a,x)={a*e^{-{Ln[2] \over 100}*x}}$

Where x = faster expiration (in percent) (use a negative value for x% slower expiration), y = resulting duration (in seconds), a = initial duration (in seconds)

Sources of expiration rate

Gems

• Temporal ChainsTemporal ChainsSpell, AoE, Duration, Curse, Hex
  Level: (1-20)
  Cost: (16-33) Mana
  Cast Time: 0.50 secRequires Level 24Curses all enemies in an area, lowering their action speed and making other effects on them expire more slowly.Base duration is (5.00-8.80) seconds
  +(0-1) metre to radius
  50% less Effect of Curse against Players
  Cursed Normal and Magic Enemies have (15-29)% less Action Speed
  Other effects on Cursed enemies expire 25% slower
  Cursed Rare and Unique Enemies have (9-18)% less Action Speed
  
  Additional Effects From 1-20% Quality:
  (1-20)% increased Curse DurationPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

• Phantasmal alternative quality HasteHasteAura, Spell, AoE
  Level: (1-20)
  Reservation: 50% Mana
  Cooldown Time: 1.20 sec
  Can Store 1 Use(s)
  Cast Time: Instant
  AoE Radius: 36Requires Level 24Casts an aura that increases the movement speed, attack speed and cast speed of you and your allies.+(0-1.9) metres to radius
  You and nearby allies gain (10-16)% increased Movement Speed
  You and nearby allies gain (15-24)% increased Attack Speed
  You and nearby allies gain (15-24)% increased Cast Speed
  
  Additional Effects From 1-20% Quality:
  (2-40)% increased Area of EffectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Buffs

• Shaper's Presence

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.

Debuffs

• Rupture

Notables

• Window of Opportunity

Masteries

• Duration Mastery

Pantheon

• Pantheon Upgrade for Soul of Arakaali: Arachnoxia found in the Toxic Sewer Map

Items

• Stasis Prison
• 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 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
  (10-15)% increased Energy Shield Recovery rate
  (10-15)% increased Life Recovery rate
  (15-20)% increased Cooldown Recovery Rate
  Debuffs on you expire (15-20)% faster