I did it twice both at snarebrook, the options given were that you basicall y were recurented for 2 weeks but if you'd done a week you could be asked t o be excused for the 2nd week they also asked for those that could go on ca ses that lasted longer than two weeks you could opt into such a case provid ing your employer didn't mind or word to thsat effect.
But you can't turn up at 10am, I think our time was 9:15am one case went on until 4:30. They want you all togethter before going into the court room y ou can't stroll in just anytime. For me the worst part was if yuo werentl called so had to stay in the build ing from when you arrived until about 4:00pm. One case we were called in at about 3:30 just to hear the defendant sworn i n and then we left, but at least the next day we could get on with the case straight away.