GREATER THAN 1 16 HR DUTY DAY CAUSED BY DELAYS DURING THE DAY IS A CONCERN OF AN ACR CREW MEMBER.

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I WAS CALLED OUT ON RESERVE TO FLY A TRIP WITH UNDER 8 HRS OF FLYING; BUT 14 HRS OF DUTY FOLLOWING SEVERAL DAYS OFF. BECAUSE OF SEVERE WX; WE PUSHED FROM THE GATE 20 MINS LATE AND ENDURED A LONG DELAY FOR DEICING. I CALCULATED OUR REQUIRED TKOF TIME (I THOUGHT) TO ENSURE 8 HRS OF REST AT OUR TOUCHDOWN AND DISCUSSED MY THOUGHTS WITH THE CAPT; WHO AGREED WE 'WOULD NOT HAVE AN 8 HR PROB.' WE DEPARTED WITHIN MY CALCULATED WINDOW; BUT EXPERIENCED 100 KT HEADWINDS AND A DELAY FOR AN APCH. AT TOUCHDOWN; I HAD FLOWN A 16 HR 15 MIN DAY; BUT FELT SECURE THAT THE 15 MINS COULD VERY EASILY BE ATTRIBUTED TO CIRCUMSTANCES BEYOND OUR CTL. THE CAPT AGAIN AGREED THAT WE DID NOT HAVE AN '8 HR PROB.' THE NEXT DAY; I HAD OVER 10 HRS OF REST. UPON PULLING UP MY TRIP RECORDS; I WAS SHOCKED TO DISCOVER IT REFLECTED 16 HRS 30 MINS OF DUTY. I RESEARCHED AND DISCOVERED 15 MINS HAD BEEN ADDED AS STANDARD POSTFLT DUTY TIME. I HAD COMPLETELY FORGOTTEN TO FACTOR IN THE RELEASE DUTY ADDITION AND BELIEVE THAT IF I HAD; WE SHOULD HAVE RETURNED TO THE GATE. SOME I HAVE TALKED TO BELIEVE WE WRE STILL FINE BECAUSE ALL DELAYS WERE DUE TO WX; BUT I THINK WE AT LEAST VIOLATED THE SPIRIT OF THE REG. I ATTRIBUTE THE ERROR TO LACK OF SLEEP AND THE EXTRA WORKLOAD ASSOCIATED WITH THE WX AND DEICING. MY RECENT EXPERIENCE HAS BEEN UNDER FAR 135 WITH NO ADDITIONAL RELEASE TIME FACTORED. I ALSO ERRED IN COMMUNICATING WITH THE CAPT WHO THOUGHT I WAS REFERRING TO ISSUES REGARDING 8 HRS OF FLT TIME VERSUS REQUIRED REST. HE WAS CORRECT IN THAT WE DID NOT EXCEED 8 HRS OF FLT TIME; BUT THAT WAS IRRELEVANT. I HAVE STUDIED THE ISSUE HARD SINCE AND WILL DEFINITELY NOT MAKE THE SAME MISTAKE AGAIN.