Midi note duration

[Thenewexhibit]

Is there a way to change the midi note duration to basically fill the gap until the next midi note? I know I can manually do it, but I figured there was an automatic command of some sort that takes the guess work out of it?

I converted audio to midi with melodyne for a bass guitar track to change the tone, and there are a handful of gaps, but I want to keep the timing and not meticulously zoom in to every gap and make sure they're lined up. Any easy automatic way? I feel Like I've found it before, but can't right now.

Thanks, and God bless!

Mike.