You live in a different state so the time period could be different. I just can’t imagine the county imposing on a citizen’s time for that long a period for just a common GJ.
This was in NYC maybe 30 years ago. But I do remember her going absolutely nuts at the thought of the 18 mo GJ. It may have met only 1-2 days a week. Honestly, I can’t remember the details beyond her reaction to 18 months.
She’d been called for a regular jury duty then made the mistake of greeting one of the attorneys she knew, so she got kicked out of that jury pool and into the GJ.