The post I wrote generally applies to PPD SEC codes, which are generally used when debiting a consumer bank account.
The 60-day rule applies to PPD SEC codes.
There's another ACH SEC code called CCD, which can be used when debiting a corporate bank account. For CCD codes, an 'unauthorized' return must be received within 48 hours, instead of the 60-days.
Here's a full list of ACH SEC codes: