When I'd studied physics, they thought the duration of a collapsar jump was exactly zero. But a couple of centuries later, they did a complicated wave-guide experiment that proved the jump actually lasted some small fraction of a nanosecond. Doesn't seem like much, but they'd had to rebuild physics from the foundation up when the collapsar jump was first discovered; they had to rear the whole damned thing down again when they found out it took time to get from A to B. Physicists were still arguing about it.
The Forever War (1974) by Joe Haldeman