My experience was similar to yours, flightpath. I was one of the ones who try to take control! And there were some startling episodes such as one juror asking whether we should find one of the witnesses guilty or not guilty. But none of the cases I was in on, were as long or as dramatically obvious as this one, and I expect the judge's direction to help them. Plus we were all encouraged by their intelligent question on the finances.
Just got back from the dentist, fearing I might have missed a crucial witness...nevertheless there's some really useful comment here, thank you all. I am agog to hear what the police computer expert is, or may be, being recalled for.