There is no schedule included. You have to delete strips when they are at the next fix or the strip is at the last fix.
eg. If a plane flies over Munich, then over Berlin and as last one over Amsterdam, then you have to delete the strip at Munich at the time the flight is over Berlin. The strip at Berlin has to be deleted when the flight arrives at Amsterdam. And because Amsterdam is the last fix, you have to delete the strip at Amsterdam at the time the flight arrives there.
But all this is clearly explained before you do the SDM test so don't worry about that.