Requested quota increase: Buckets

I have a requirement where I need to increase quota for s3 buckets in the all hoverboard accounts. The default value is set to 100. When I try to increase the quota to 150, a support case is requested to the 'AWS support'. It takes 3-4 hours to get this case approved. Is there any default number foe which support case will not be requested to AWS support and the request will be auto-approved.