PLT OF PIPER CHEYENNE; PA31T; ENTERED CTLED AIRSPACE DURING DEP AFTER FLT PLAN VOID TIME.

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ON APR/XA/99 I RECEIVED THE FOLLOWING CLRNC; VIA TELEPHONE: CLRED FROM GPH TO TYS AS FILED; ENTER CTLED AIRSPACE HDG 140 DEGS TO 3000 FT; FL230 IN 10 MINS; CONTACT DEP 119.0; SQUAWK XXXX; VOID AT XX23Z; CURRENT TIME XX21.5Z. I; AS PIC; USED POOR JUDGEMENT IN ACCEPTING THIS CLRNC. ENTERING CTLED AIRSPACE; I WAS INFORMED THAT I WAS LATE (6 MINS) OR PAST MY VOID TIME. I WAS ALSO ASKED TO CALL UPON LNDG. I RECEIVED A VERY GOOD LECTURE ON USING VOID TIMES AND CLRNCS! THE FIRST ITEM THAT WOULD DECREASE THE LIKELIHOOD OF THIS HAPPENING TO ANOTHER PLT WOULD BE NO CLRNC WITH A 2 MIN VOID TIME GIVEN OVER THE TELEPHONE. SECOND; PLTS NEED TO KNOW; ATC NEEDS CONTACT; RADAR OR RADIO; WITH YOU WITHIN THE VOID TIME. JUST BEING AIRBORNE IS NOT ENOUGH TO JUSTIFY REQUIREMENTS. THIS PARTICULAR AREA; ATC RADAR POP-UP AROUND 1500 FT. THIRD; CTLRS SHOULD GIVE ACFT A MARGIN OF ERROR; ESPECIALLY WHEN DEPARTING FROM AN UNCTLED FIELD. THE BACK TAXI AND HAVING TO RESECURE THE FORWARD BAGGAGE DOOR COST ME TIME. I ALREADY HAD PREFLT COMPLETE AND WAS READY. WAITING ON ANOTHER ACFT; BACK TAXI; ANY NUMBER OF VARIABLES CAN DELAY TKOF 4-5 MINS. IN MY CASE; THE BACK-TAXI AND BAGGAGE DOOR PROB. FINALLY; AS PIC; I SHOULD NOT HAVE ACCEPTED SUCH A SHORT VOID TIME; AND FROM THIS TIME FORWARD I WILL NOT ACCEPT ONE LESS THAN 15 MINS. EVERYONE INVOLVED IN THIS WAS VERY PROFESSIONAL AND POLITE. I LEARNED SOMETHING; AND HOPEFULLY THEY DID TOO.