TWR LCL CTLR CLRED A C152 FOR TKOF ON RWY 36 AND SHORTLY THEREAFTER CLRED AN E120 FOR TKOF ON RWY 10. E120 ABORTED TKOF WHEN HE SAW THE C152 CROSS THE INTXN OF THE RWYS AT APPROX 200 FT. CTLR SAYS HE HAD BEEN ON THE LCL CTL POS TOO LONG WITHOUT A BREAK.

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I WAS ON LCL CTL FOR ABOUT 3 HRS. CLRED CESSNA FOR TKOF ON RWY 36. THERE WAS MAJOR CONSTRUCTION ON ARPT RWYS AND TXWYS. THE E120 HAD BEEN BACK TAXIED ON RWY 10 AND WAS HOLDING ON THE NUMBERS WAITING FOR HIS COMPANY NUMBERS. AFTER SEVERAL QUESTIONS HE SAID HE WAS READY. I CLRED HIM FOR TKOF. HE ABORTED BEFORE XING THE INTXN OF RWY 36. THE CESSNA WAS AIRBORNE AND OVER THE INTXN OF BOTH RWYS. CAUSE: I WAS ON POS TOO LONG WITH TOO MANY UNUSUAL SITS GOING ON FOR A LONG PERIOD. THERE WERE NUMEROUS RWY XING WITH STEAM-ROLLERS; BTWN ACFT; WIND SHIFTS; RWY CHANGES BECAUSE OF CONSTRUCTION AND WINDS. HAD NUMEROUS TOUCH AND GOES. STAFFING WAS ONLY 2 PEOPLE AND BOTH HAD BEEN ON POS FOR OVER 3 HRS WITH NO BREAK. RELIEF CTLR WAS ON SICK LEAVE. TFC WAS TOO BUSY TO STAFF WITH ONE PERSON FOR BREAKS. THE PROB WAS DISCOVERED WHEN THE E120 ABORTED TKOF AS THE CESSNA WAS XING THE INTXN IN FRONT OF IT AIRBORNE ABOUT 200 FT AGL. SOLUTIONS: BETTER SCANNING AND MORE BREAKS. I WAS DISTR BY THE E120 DELAYS FOR NUMBERS; TRYING TO HAVE GND GET EQUIP OFF RWY 10; GET AN IFR INBOUND IN SIGHT SO ACFT COULD BE RELEASED WITH VISUAL SEPARATION. THE E120 DECIDED HE WAS READY AND IT HAD BEEN A WHILE SINCE I HAD CLRED THE C152 FOR TKOF WITH A LOT OF DISTRS BTWN. DIDN'T DO ANOTHER SCAN WHEN THE E120 WAS CLRED FOR TKOF.