Rangers Inspired Moment says 'Until the end of your next turn?'

[Wakrob]

Since this ability is a free action that Im assuming you have to use during your turn....when exactly does the the power end?

Inspired Moment (Ex): At 11th level, the guide can have an inspired moment once per day as a free action. The ranger gains the following benefits until the end of his next turn. His speed increases by 10 feet. He can take an extra move or swift action on his turn. He gains a +4 bonus to AC and on attack rolls, skill checks, or ability checks. Finally, he automatically confirms any critical threat he scores. He can use this ability one additional time per day at 19th level. This ability replaces quarry and improved quarry.

Wakrob

[wraithstrike]

It ends when you end your next(not current turn).

Example

Round 1:
Free action to activate inspired moment
You get to use the ability.

Round 2:
You get to use the ability
then at the end of this turn it is off.