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'''Ability Duration''' determines how long the effect of abilities and items last.

== Calculation ==

=== Calculating Ability Duration ===
Multiple sources of Ability Duration stack '''multiplicatively''', not additively:

<math>\text{Total Ability Multiple sources of Ability Duration stack '''multiplicatively''', not additively:} = 1 - (1 - R_1) \times (1 - R_2) \dots</math>

'''Example:'''
With '''15%''' from {{ItemIcon|Magic Carpet}} and '''15%''' from {{ItemIcon|Diviner's Kevlar}}:
# Convert percentages to decimals: 0.15 each.
# Subtract from 1: (1 - 0.15) = '''0.85''' and (1 - 0.15) = '''0.85'''.
# Multiply the differences: 0.85 × 0.85 = '''0.7225'''.
# Subtract from 1: 1 - 0.7225 = '''0.2775'''.
# Total Ability Range bonus is approximately '''27.8%''', not 30%.

== Sources of Ability Duration ==
{{Item stat table|Ability Duration}}
{{Stat navbox}}
[[Category:Gameplay]]