First, I'm sorry if this has been covered before - being a bit new has that disadvantage. I'm just curious if anyone knows how long the CSIs take to film. I mean, there are around 24 episodes in a series; do they take 2 weeks per episode, or is it not that straightforward? Do they finish one before they start on another? I realise there are generally more than one unit filming at a time. I guess it's obvious that an episode is not filmed in sequence - too wasteful of sets and actors' time. Sometimes the leads have relatively little screen time in an episode, so I would expect their stuff to be done in one or two blocks. But what do I know? (Nothing!) Really idle curiosity, but is anyone close enough to the business to explain?