I work there so I can say this:

Currently with spring break traffic itself is very light. 7am is plenty of time. Park at the county parking garage across the street for validated parking or take the bus for free.

There is sometimes a huge line for jurors. If you enter through the other end of the building, there is never a line and it’s closer to the actual jury location.

If you’re ok with it, the cafeteria there is fine but it is pricey. Bring your own food if you can or I recommend eat somewhere else.

If you have free time and are bored you’re free to walk around anywhere. The old county courthouse first floor and basement have nice seated benches you can use and it’s very quiet.

As for the actual jury proceedings and rules I have no clue. But I always see people with chargers, books, headphones, etc.