AITM STAND TIME

IN AITM SOME FLIGHT WILL SAY STAND TIME IS GREATER THAN 1 HOURSFOR END OF FLIGHT FOR INSTANT AT (6 HOURS KPHL-PHILADELPHIA INT'L TOKBFM-MOBILE DOWNTOWN,ALB) DISTANCE 837nmFLYING A B-737 300 AND IF I CHANG IT TO 4 HOURS IT WILL SAY(TOTAL FLIGHT TIME EXCEEDS MAXIMUM ALLOWED TIME OF 4 HOURS)IS THTRE ANY WAY TO SET THIS TO WHERE STAND TIME AT END OF FLIGHT IS LESS THEN (1 HOUR)?OR DO WE JUST HAVE TO LIVE IT?THANKSSAM707