Quickened Stealth (3.5e Feat)
From D&D Wiki
Quicken Stealth [General, Special, Skill Feat]
After training for so long, your body has become accustomed to the dark corners of the world. It is easier for you to pass undetected and disappear at a moment's notice. Sneaking just got a whole lot easier.
Prerequisite: Character lvl 10, Access to Rogue Special ability, Hide 5 ranks, Move Silently 5 Ranks
Benefit: When using a Hide action, you may Hide as a swift action instead of a movement action.
Normal: When using a Hide action, you may Hide as a movement action.