Different states/locations do things differently. In Wisconsin years ago I was summoned for jury duty where I could be called for alternate months during a 6 month period. Nothing happened until a week or two before our planned vacation (for AFTER my time was up). I went and even got to make some statement when they questioned me that would perhaps have caused problems- even a mistrial- during the trial per one of the lawyers I spoke to afterwards. Some insurance thing- I mentioned deep pockets, am a physician. Gee, they did not want me but did not eliminate me before I got to make the statement.
Retired to Florida- Tampa. H got his summons for one time- was so cold he got excused that day by that judge and got a letter from a local MD for a permanent excuse. He really suffered in the air conditioning. I got a summons for a cattle call where I spent the morning waiting around and was not chosen. I have no idea when I could next be up- no time window like in WI. I do know people could put info about plans on the form submitted.
I don’t know if knowing one could be called up (and miss income, pay for sitter- more than compensation) only during a certain time frame or having it unknown is better.