ACR LTT PIC VOICES CONCERN OVER POSSIBLE VIOLATION OF PLT FLC WORK SCHEDULING RULES AFTER DIVERSION TO ALTERNATE ARPT ACCOUNT WX DELAYS HIS RETURN TO DEST ARPT. SCHEDULED WORK DUTY TIME EXCEEDED.

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I WAS SCHEDULED TO DO A COMMUTER FLT ARRIVING BACK AT ANC AT XB10 LCL. I HAD STARTED MY DAY AT XA15 LCL SO I SHOULD HAVE BEEN BACK APPROX 1 HR BEFORE MY DUTY DAY EXPIRED. APPROX 30 MINS OUT OF ANC; UNFORECASTED FOG FORMED IN ANC AND THE RVR WENT DOWN TO 1000 FT. MY MINIMUMS WERE 1800 RVR; SO AFTER HOLDING ABOUT 5 MINS I PROCEEDED TO ENA FOR FUEL. AFTER ABOUT 40 MINS THE WX IN ANC WENT TO BETTER THAN 1000 FT CEILING AND 10 MI VISIBILITY. WE COMPLETED THE FLT AND I ACCIDENTLY EXCEEDED MY DUTY TIME BY 25 MINS. I HAD GOTTEN MY UNDERSTANDING OF DUTY TIME LIMITS CONFUSED AND WAS THINKING THAT I WOULD JUST NEED TO ACCOMPLISH THE REQUIRED REST PERIOD TO BE LEGAL. IT WAS AFTER I WAS OFF THAT I REALIZED MY MISTAKE. I DID NOT GET THE FARS OUT TO CHK SINCE MY 40 MIN GND TIME WAS VERY BUSY. I HAD 16 PAX TO ATTEND TO (1 A DEAF; UNACCOMPANIED MINOR -- NO LIP READING AND MINIMAL READING SKILLS). I HAD TO TAXI TO THE FUEL PIT TO GET FUEL MYSELF AND I HAD A NEW COPLT WITH 3 DAYS ON LINE THAT I WAS KEEPING TRACK OF. THERE WAS LITTLE TO BE DONE TO CORRECT THE SIT AS I WAS ALREADY OFF DUTY AND THE EVENT HAD OCCURRED. THE ONLY THINGS WERE TO REAFFIRM THE REG SO THAT I DID NOT LET THIS HAPPEN AGAIN AND TO PASS THIS INFO ALONG TO THE NEW FO TO INSURE HIS UNDERSTANDING. (HE WAS MY SECOND FO OF THE DAY; SO DID NOT VIOLATE HIS DUTY TIME.)