The default setting for IOB is to allow multiple draft submissions to Turnitin (via IOB Learn) for the student and you are allowed up to 3 draft submissions in a 24-hour period. Your first four submissions (your first plus three re-submissions) will generate a new similarity/authorship report instantly and any subsequent submissions will incur a 24-hour delay.
Once you are satisfied with your submission you will upload as your ‘final submission’ and this is what will be corrected by your module co-ordinator.