It will not let me edit the quiz result slides length.

I tried to explain the functionality of question/score slides in two blog posts. You'll find some tweaking ideas there as well:

Question Question Slides in Captivate - Captivate blog

Question Question Slides - Part 2 - Captivate blog

If you explained why you want to edit the length of the score slide? Or did you perhaps delete essential elements embedded in that slide and have now problems?

Continue button when clicked should normally execute one of the actions you specify in the Quiz Preferences.

Another tip: please tell which version you are using, and give the complete version number that you can find in Help, About Captivate.

The Quiz Results slide will always pause and there's no way to prevent that.  Look at its timeline and you can see a faint vertical line that indicates the pause point.  You can use your mouse to move this sideways and delay the pause untill objects enter the timeline.  But the rest of the slide beyond that pause point will only play once you click the Continue button.  If you have set a very long duration for the Quiz Results slide, then once you click Continue, what you see as the Continue button not working could just be the timeline continuing to play until it reaches the end of the slide.  Watch the scrub bar on the playback bar to see if it's moving.

Once the slide is paused the user has to click one of the buttons on that slide to move elsewhere.  If your Continue button is not working, the usual reason is that you have the Quiz > Settings > Required option set to something that will prevent the learner from moving beyond the Quiz Results slide until they fulfil some kind of requirement (e.g. answer all questions or pass the quiz).  So check that setting.