How long does it take for a fee waiver to process?

Excuse me, could you please clarify the timeframe for processing a fee waiver? I'm curious to know how long it typically takes for such a request to be reviewed and approved. Is there a standard processing period that can be expected, or does it vary depending on the specific circumstances of each case? Additionally, are there any steps that can be taken to expedite the process, or are there any common reasons for delays that I should be aware of? Thank you for your time and assistance.