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There is a Legacy version here.

PFS StandardExtend Elixir Feat 12

Alchemist 
Source Player Core 2 pg. 67 1.1

Integrating your own personal energy into the elixirs you create causes them to affect you for longer. When you consume one of your alchemical items that has the elixir and infused traits and a duration of 1 minute or longer, that elixir's duration is doubled. If you created the item with Quick Alchemy, this can't cause it to exceed the 10-minute duration limit.

Extend Elixir Leads To...

Eternal Elixir, Persistent Mutagen