Port, you got the idea. For example here in Winnipeg, our runway 18 is 11000 feet long. Using LAHSO we have 7200 available to remain clear for the intersection for our runway 13. Different aircraft categories require different lengths or do not hold short at all (can catch you out as earlier 737s do, yet the NG stuff doesn't have the required length here for the procedure). I can go and dig out the table if somebody wants.
Just to explain a little further (and things are a little different here in Canada to the UK regarding reduced separation in the vicinity of an aerodrome versus anadian Automatic Control Transfer or ACT), for LAHSO to be in effect our tower must be in VFR conditions with ACT in effect. Without VFR ocnditions, terminal/approch controllers cannot utilise LAHSO and must provide standard IFR separation.