From Page 123 of DW; The Meditation Talent Description
Success on a Willpower Test and 10 minutes without interruptions removes one level of fatigue.
From page 251 of DW; Removing Fatigue
Each 10 minutes of normal rest that includes no combat, no psychic powers and no strenuous activity removes one level of fatigue.
How exactly is the Talent (which costs a Rank 3 Librarian 500 advance points) an advantage ?