I hope you've saved your energy. If you haven't... you might not last five minutes.
15 seconds sound clip from the Kill Bill: Volume 1 movie soundboard.
You can hear this line at 01:31:13 in the Blu-ray version of the movie.
Quote context
[...]
- Okinawa.
- Whom in Okinawa made you this steel?
- This is Hattori Hanzo steel.
- You lie!
- Swords, however, never get tired.
- I hope you've saved your energy. If you haven't... you might not last five minutes.
- But as last looks go, you could do worse.
- Silly Caucasian girl likes to play with samurai swords.
- You may not be able to fight like a samurai. But you can at least die like a samurai.
[...]