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All Rules in Designing Spells

The Golden Rule
Spell Terminology
Intended Level
Function
Spell Research
Spell Damage
Target
Damage Caps
Range
Duration
Saving Throw
Spell Resistance
Casting Time
Components
School
Bonus Type
Description
Hierarchy of Attack Effects
Depletable Statistics
Core is King
Multipurpose Spells
Choosing Descriptors
Benchmarks

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Duration

Source Ultimate Magic pg. 130
There are no hard-and-fast rules for determining how long a spell should last at a particular level; a weak spell may last hours, while a powerful one may only last a few rounds or be spent in one action. Your best bet is to compare your spell’s effect and duration to those of similar spells of its intended level and spells one level below and above that. Make sure you are fully aware of the differences between “instantaneous” spells and “permanent” spells.

Archives of Nethys

Rules | GM Screen

All Rules in Designing Spells

Duration