My ideal plot scene time is 2 hours; max 3 hours. If I'm GMing and it goes longer than that, I apologize and consider it a failure. People get bored and tune out at around the 2.5 hour mark in my experience.
What @Valkyrie said about pose ground rules is important. I think it's the GM's job to herd people along if they're taking a long time to pose, and skip them if necessary. Don't let one player derail the plot for everyone.
@arkandel said in Plot session duration:
How easy is it for a PrP runner to predict how long a scene is likely to run in the first place?
So I take the opposite approach and make them take a certain duration rather than trying to predict how long they're going to take.
If the players are going too slow despite my efforts to speed them along, I might gloss over or change some of the things I had planned. In a combat scene, for instance, I might tune down the difficulty on the remaining NPCs so they get taken out quickly, or cancel a wave of reinforcements I had planned. If it's a meeting with the Commander, they might get called away suddenly with a "We'll have to pick this up next time..." Worst case, we can FTB and handwave the end.
OOC Time > Plot, in other words. In this regard it's not unlike a convention game that has a fixed timeslot.
@arkandel said in Plot session duration:
if IC it's a single uninterrupted adventure that gets broken down into two parts for OOC convenience how do you best handle concurrent on-grid RP taking place between those PrP sessions?
I do everything possible to avoid this situation because It sucks. The OOC convenience of breaking it down rarely outweighs the OOC inconvenience of being scene-locked or having to dance around continuity issues with scenes taking place out-of-time.
@arkandel said in Plot session duration:
How do you handle players having to go in mid-scene due to RL
Try to pose them out ICly if possible - they got called away, stepped out to take an important phone call, went to the bathroom, got knocked unconscious, their fighter started having sudden engine trouble, whatever.
Otherwise they become puppetted in the background.