Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Club | Entered\nadministration | Exited\nadministration | League(s) | Deduction(s) |
| --- | --- | --- | --- | --- |
| Charlton Athletic | February 1984 | March 1984 | Second Division | None |
| Middlesbrough | 21 May 1986 | July 1986 | Third Division | None |
| Tranmere Rovers | 1987 | 1987 | Fourth Division | None |
| Newport County | 1989 | Never - they went out of business and then reformed | Football Conference | None |
| Walsall | 1990[citation needed] | − | − | None |
| Northampton Town | 1992[citation needed] | − | − | None |
| Kettering Town | 1992[citation needed] | − | − | None |
| Aldershot | 1992[citation needed] | − | − | None |
| Maidstone | 1992[citation needed] | − | − | None |
| Hartlepool United | 1994[citation needed] | − | − | None |
| Barnet | 1994[citation needed] | − | − | None |
| Exeter United | 1994[citation needed] | − | − | None |
| Gillingham | 1995[citation needed] | − | − | None |
| Doncaster Rovers | 1997[citation needed] | − | − | None |
| Millwall | 21 January 1997 | June 1997 | Second Division | None |
| Bournemouth | 1997[citation needed] | − | − | None |
| Crystal Palace | 1998[citation needed] | July 2000 | Second Division | None |
| Chester City | October 1998 | July 1999 | Third Division | None |
| Portsmouth | 1998[citation needed] | 1999 | Second Division | None |
| Hull City | 7 February 2001 | 12 March 2001 | Third Division | None |
| Queens Park Rangers | 2 April 2001 | 17 November 2002 | First Division | None |
| Halifax Town | 9 April 2002 | March 2003 | Third Division\nFootball Conference | None |
| Bradford City | 16 May 2002 | 1 August 2002 | First Division | None |
| Notts County | June 2002 | December 1993 | Third Division | None |
| Barnsley | 3 October 2002 | 25 October 2003 | Second Division | None |
| Leicester City | 21 October 2002 | 16 November 2004 | First Division | None |
| Port Vale | 16 December 2002 | 2003 | Second Division | None |
| York City | 18 December 2002 | 26 March 2003 | Third Division | None |
| Derby County | 20 October 2003 | 20 October 2003 | Championship | None |
| Ipswich Town | 10 February 2003 | 30 May 2003 | First Division | None |
| Wimbledon | 5 June 2003 | 21 June 2004 (As MK Dons) | First Division | None |
| Darlington | 23 December 2003 | 26 May 2004 | Third Division | None |
| Bradford City | 27 February 2004 | 10 December 2004 | First Division\nLeague One | None |
| Wrexham | 3 December 2004 | 3 August 2006 | League One\nLeague Two | −10 pts |
| Cambridge United | 29 April 2005 | 22 July 2005 | League Two | −10 pts |
| Rotherham United | 13 May 2006 | ??? | League One | −10 pts |
| Crawley Town | 5 June 2006 | 10 August 2007 | Conference National | −6 pts |
| Boston United | 25 April 2007 | 20 May 2008 | League Two | −10 pts |
| Leeds United | 4 May 2007 | 11 July 2007 | Championship\nLeague One | −10 pts\n−15 pts |
| Luton Town | 22 November 2007 | 28 July 2008 | League One\nLeague Two | −10 pts\n−20 pts |
| Bournemouth | 8 February 2008 | 18 July 2008 | League One\nLeague Two | −10 pts\n−17 pts |
| Rotherham United | 18 March 2008 | 2008[1] | League Two | −10 pts\n−17 pts |
| Halifax Town | 26 March 2008 | 13 June 2008 | Conference National | −10 pts |
| Darlington | 25 February 2009 | 7 August 2009 | League Two | −10 pts |
| Southampton | 2 April 2009 | 8 July 2009 | Championship\nLeague One | N/A\n−10 pts |
| Stockport County | 30 April 2009 | 18 June 2010 | League One | −10 pts |
| Chester City | 17 May 2009 | 10 March 2010\nDissolved | Conference National | −25 pts |
| Northwich Victoria | 15 May 2009 | 16 May 2010 | Conference National | −10 pts |
| Farsley Celtic | 30 June 2009 | 10 March 2010\nDissolved | Conference North | −10 pts |
| Salisbury City | 3 September 2009 | 26 February 2010 | Conference National | −10 pts |
| Weymouth | 28 October 2009 | 27 November 2009 | Conference South | None |
| Crystal Palace | 26 January 2010 | 20 August 2010 | Championship | −10 pts |
| Portsmouth | 26 February 2010 | 24 October 2010 | Premier League | −9 pts |
| Plymouth Argyle | 4 March 2011 | 31 October 2011 | League One | −10 pts |
| Rushden and Diamonds | 7 July 2011 | 8 July 2011\nDissolved | Conference National | None |
| Darlington | 3 January 2012 | 21 june Dissolved 2012 | Conference National | −10 pts |
| Portsmouth | 17 February 2012 | 19 April 2013 | Championship | −10 pts |
| Port Vale | 9 March 2012 | 20 November 2012 | League Two | −10 pts |
| Coventry City | 21 March 2013 |  | League One | −10 pts |
| Aldershot Town | 2 May 2013 |  | League Two |  |
Question:
how long was charlton athletic in administration?
Answer:
1 month