Straight Off Base tube clips come in three lengths...
LONG: These clips are slightly over 10 minutes in length, sometimes up to 12.
MED: These clips are a little over 5 minutes long.
SHORT: These clips are generally a little over 2 minutes in length, the same length as a preview clip except it's one continuous short scene.
...and two sizes for each length:
LARGE: 1280x720px, file sizes vary depending on the length.
SMALL: 640x360px, and of course file size vary depending om the length of the clip.