in logic pro, you select the notes who's lengths you want to edit, and you press and hold SHIFT + ALT while dragging notes to the desired length. this shortcut makes it so that all notes are adjusted to the exact same length.
this was an essential tool for keeping my midi clips clean and organized when triggering samples such as drum hits and allows much more efficient note length editing for synths, etc.
i was pretty disappointed to learn that this feature exists in nearly every DAW except Live.. Live is so good. Don't give any other companies the upper hand on this one!