FO OF ACR WDB ACFT RPTED AN ERRONEOUS 'ESTIMATE' DURING AN INTL PACIFIC OCEAN FLT RESULTING IN ATC BELIEVING THAT THE FLT HAD NOT MET THEIR FLT ESTIMATES WITHIN PRESCRIBED LIMITS.

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MAY NOT HAVE MAINTAINED LONGITUDINAL SEPARATION FOR ACFT IN THE PACIFIC OCEAN REGION SUCH AS POS RPT ETA NOT WITHIN PLUS OR MINUS 3 MINS AT POS 'A' I XMITTED ETA FOR NEXT MANDATORY POS RPT 'B' AS XX30; THE ETA WAS BASED ON THE ETA GIVEN BY THE INS. THIS TIME APPEARED EARLY AND I THOUGHT I HAD WRITTEN AND XMITTED XX33; BUT BASED ON THE FLT PLAN; I DID WRITE; AND MUST HAVE XMITTED XX30. MIDWAY BTWN POS 'A' AND 'B;' IN ACCORDANCE WITH PUBLISHED PROCS; I OBTAINED WX AND CHKED THE ETA FOR 'B;' THE ETA APPEARED VALID; FOR EITHER XX30 OR XX33; AS I CAN'T POSITIVELY STATE WHICH ETA I WAS TRACKING. I FEEL I WAS MENTALLY CUED TO XX33; BUT AGAIN; THE FLT PLAN REFLECTED XX30. AS THIS WAS ONLY MY SECOND FLT TO THE FAR E; AT APPROX 3/4 DISTANCE TO POS 'B' THE CAPT TOOK THE FLT PLAN AND BEGAN A DISCUSSION ABOUT OUR SUBSEQUENT POS; THE RELEASE POINT; RELEASE CLRNC PROCS; HE ALSO OBTAINED DEST WX. AS HE STARTED THIS DISCUSSION; I AGAIN CHK THE ETA FOR POS 'B.' NEARING POS 'B' WE COMPLETED OUR 'APCHING WAYPOINTS CHKS' AND WERE COMPLETING 'OVER THE WAYPOINT CHK' TOKYO RADIO CALLED. THIS CALL INTERRUPTED OUR FLOWS AS WE ANTICIPATED A RE-RELEASE CLRNC; HOWEVER; RADIO STATED TOKYO CTL WANTED AN UPDATE ON OUR POS. THE AFOREMENTIONED INTERRUPTED MY LOGGING OUR ARR TIME AS MTG CHANGED OVER. I CALLED BACK AND GAVE A POS RPT WITH POS 'B' AS XX35. SHORTLY THEREAFTER; RADIO CALLED AND VERIFIED OUR POS RPT; AT THAT TIME; THE CAPT POINTED TO THE 5 MIN DIFFERENCE ON THE FLT PLAN AND STATED THAT WAS WHY TOKYO CALLED BACK; THAT IT SHOULD BE NO MORE THAN 3 MINS.