Be prepared for a lot of hanging about - take a good book !!!
I work part-time in the Crown Courts, and the number of cases that start on time can be counted on the fingers of one hand !!!
Once a trial actually starts then timings are reasonably good, but getting to that point can take a long time... numerous legal arguments, plea changes, evidence discussions, witnesses not turning up .. all adds up to the jury panel hanging around just waiting to be "sworn".
It is very surprising how many folks who sit on a jury get "interested" in the Courts and ask about jobs, and quite a few go further and apply to be magistrates.
But the Magistrates Court is a totally different ball-game to Crown Court ... you won't find me in a "maggies" if I can help it !!!

Oh .. and BTW ... out of Court the Judges DO have a sense of humour ... and most of them are really nice guys (and the ones I work with don't understand some of the happenings we read about either) .. it's just that in Court they have a very serious job to do ... and at all times have to keep the "Court of Appeal" in mind as ANYTHING the defence barrister can use to appeal ... they will.