Yes, I've done JD in a Crown Court. It affected me and also my relationship. I was never quite the same again after it. I dread to be called up again. I was under the impression that if you've done it once, you can be excused if called again but annoyingly found out last week that that isn't the case.
For those in employment and whose employers do not pay them for their JD absence, you'll likely be out of pocket. Unless it's changed since I did it many years ago, they covered my bus fare but the other expenses were nowhere near enough to cover my salary and living on my own at the time with a high mortgage (bought in a peak), meant being left in a real financial predicament. I really do hope it's changed since back then as it's really unfair to put people who haven't asked to be called for JD to risk defaulting on their mortgages or rent.
In terms of the day to day, for the first three days was boring, sat in a room waiting. Then we were called, told it would be a long case, were only allowed to say no if you could prove you had a holiday booked. You need to be alert during the case, listen to everything, you have the defendants only metres away from you, watching you. Sitting there for hours dying to use the loo but cannot leave. You're not allowed to discuss the case with anyone.
Then when you go to deliberations, that was just awful. Shut in a room with 11 others, when you cannot agree, there are arguments. Not allowed to leave the room without permission from the judge. No privacy to use the toilet as only a door between you and the 11 others, within the room. One juror who I got on with really well at the start, well we ended up shouting at each other when we couldn't agree on a verdict. It was awful, he turned really nasty.
You will likely have other jurors who just want the power of sending someone to jail, regardless of whether there is the evidence to return a guilty verdict or not.
It's extremely frustrating.
No idea why so many people are dying to be called up for it.