Day Tripper (perk)

 is a challenge perk in Fallout: New Vegas, granted after taking 25 addictive chems.

Effects
You've done enough chems to know how to hang on to the effects just a while longer. More specifically, ingested chems last 33% longer than they normally would.

This perk stacks with the Chemist perk. The chem is increased by 33% first with Day Tripper then doubled with the Chemist perk.

If you have both Day Tripper and Chemist, then all consumable foods have their times increased. Brahmin meat last for 15 seconds, with these two perks it increases the duration up to 40 seconds. It is not known if this was intentional or a glitch seeing as how consumable foods are not chems.

Behind the scenes

 * It is a reference to The Beatles' song of the same name.