I assume you're publishing for SCORM 1.2 or 2004 Editions 1 or 2. To see how much suspend data you're using in SCORM Cloud, open the Course Sandbox page and click on the View Registration State button. Expand the last item in the list (usually the name of the course), and scroll down to cmi.suspend_data. Select the whole line (start at the beginning and drag down to select the whole line (it's a long line)). Paste that into Notepad and move the cursor to the end of the string and observe the character count in the footer of the Notepad window. That's how much you're using. I'm guessing it'll be close to the 4096 characters allowed with those SCORM versions.
To test this, go back to the Course Sandbox page, scroll down to Course Properties, choose the Compatibility Setting tab. Change the Maximum Suspend Data Size to something much bigger than 4096 (I just add a zero to the end to make it 40960) and click on the Save button. Go back to the top and click on the reset progress button and clear the logs. Run through the whole course and come back and check the suspend_data again.
There are ways of reducing the amount of suspend data that's used, but that's a different discussion.