Throttling issues when applying sensitivity labels via PowerShell

We need to apply a base sensitivity label for over 200 teams by following the scripts here: https://practical365.com/sensitivity-labels-assign-teams/ but after applying labels to 4 or 5 teams (groups), we're getting throttling errors.  We've tried putting a 30-second delay between command executions, but it's not helping.  Is there a better way to do this, other than to keep trying longer sleep times?