I would still maintain that 3 hrs per charge is a long time!
After all, if the jury believed Rolf lied about the first charge they considered, then that would bear heavily on how they approached the other charges i.e they would have started with fact that they believed Rolf was a liar!
And, of course, these trials are very much about " he said, she said".

No, there must have been some jury members who took a lot of convincing of Rolf's guilt. i.e. they were probably "worn down" by other jury members.