You did not say what type of display you have.
We are assuming that it is an ALGE (but others have similar controls)
Go into "Setup and Test" in Split Second
Click on Scoreboard and your display should already be there listed.
The "seconds to freeze on a finisher" should be set on 10 seconds as the default.
If that is too long, lower the value with the down arrow or highlight and type a new value in such as 05.
Experiment until you find a value that works for you.
Keep in mind the time required for 2nd run total times.