Apollo 13 traveled for approximately 10 days from launch to splashdown.

Here's a breakdown:

* Launch: April 11, 1970

* Lunar orbit insertion: April 13, 1970

* Incident: April 13, 1970 (an oxygen tank exploded)

* Lunar orbit departure: April 14, 1970

* Earth entry and splashdown: April 17, 1970

It's important to note that while the mission was scheduled for a three-day lunar landing, the explosion significantly altered the flight path and extended the overall duration.