Can't change my object duration on timeline Total noob question, but how do I change the duration (in/out point) as to where it cuts in and out (appears) on the timeline.
First go to the Timeline window.

There you can define your rendering and playback range by choosing your start frame and end frame:



In order to adjust your keyframes
open the Dope Sheet window:




Press A to deselect all keyframes
Press B to border select the keyframes you want to adjust
Press G to move the selected keyframes to the desired position