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Summary: Use the quantize editing feature of Pro Tools to adjust the length of MIDI tracks. Extend the duration of MIDI tracks in Pro Tools with the tips in this free video on music recording software from a professional musician.
"What I'm going to show you how to do next is really just edit the midi data I just recorded. Now the midi data I just recorded is basically two bars. What I'm going to do real quick is look at this first bar right here. And see how it's a little extended, I'm just going to shorten it up just a tiny bit. So I'm going to shorten it up a little bit and just take this last note and just move it down a little bit. Now I'm going to look at the whole thing, because I did a couple of notes under it, so make sure I see this, and it seems alright. What I'm going to do is, maybe highlight just these two notes, pressing shift, and just extended just a little bit. Now once I have this all set, the last thing I'm going to do is, I'm going to quantize it, by going to midi, and groove quantize. I can do regular quantize as well, it's going to be more straight forward, but I like to use a little bit of a groove, just so it adds a little more of a realistic feel. Press apply, and it should be all set. So now I take this measure, copy it, bring it to the very beginning, and duplicate it. So now it should be all set."
eHow Article: Pro Tools MIDI Editing: Editing MIDI Data