Zappo
Explorer
Ouch. However, this "temporal railroading" is usually the only way to actually have those cool scenes where the villains narrowly escapes or is narrowly thwarted. Otherwise, it is just too unlikely for the PCs to arrive within one hour of the Event (TM), let alone one minute. If I never used it, I would have to renounce a lot of them.
So, I often adjust the villain's arrival time in order to get better drama. That said, the key word here is "adjust" - not "revolutionize". I act to compensate for random variations in the PCs' schedule, not against purposeful variations.
If the PCs actively do something to arrive there before the villain, and that something does work, they will succeed. Similarly, if they waste time, they will arrive when the deed is already done.
In your case, it is clear that the drow were supposed to arrive at the illithid city after one week - but since you found a way to get there in a day, they arrived in a day. One week versus one day is a variation of, what, 86%? The DM did this for drama, but he also rendered pointless your hurry in getting there. This far outweighs the benefits; I would never do it.
So, I often adjust the villain's arrival time in order to get better drama. That said, the key word here is "adjust" - not "revolutionize". I act to compensate for random variations in the PCs' schedule, not against purposeful variations.
If the PCs actively do something to arrive there before the villain, and that something does work, they will succeed. Similarly, if they waste time, they will arrive when the deed is already done.
In your case, it is clear that the drow were supposed to arrive at the illithid city after one week - but since you found a way to get there in a day, they arrived in a day. One week versus one day is a variation of, what, 86%? The DM did this for drama, but he also rendered pointless your hurry in getting there. This far outweighs the benefits; I would never do it.