You don't need a three-page letter. Valid reasons typically include:
If you own a business or work hourly, you have the strongest lever. Most judges are reasonable people who understand that a closed business doesn't pay taxes. postpone jury duty better
You are basically putting yourself on a list to fill a cancellation. You will likely get called within 2-4 weeks, but you will have zero choice in the date. This is risky, but it works if you have a flexible schedule and just need to avoid one specific week. You don't need a three-page letter
If you are a teacher, request a date during summer or winter break. If you are a CPA, ask for a date after tax season. postpone jury duty better