The performance limit for the stopway is half the takeoff flare distance.
Some clarification for those who might be confused by this statement.
Distance to liftoff must be such that at least half of the distance from liftoff to screen (takeoff flare distance) is over the TORA. Hence one can only schedule half of the flare distance beyond the TORA and into the TODA which provides the practical limit on clearway.
The BCAR rules used 1/3 rather than 1/2 but that is probably of little interest to anyone these days.
Generally we would cite clearway rather than stopway for the second part of the takeoff flare .. but, no matter.
we still have the MD11 which doesn't account for a Stopway or Clearway
I always had a suspicion that no-one at Long Beach had any concept of stopway or clearway.