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:
| Actor/Actress | Character | First Appearance | Last Appearance | Duration | Total |
| --- | --- | --- | --- | --- | --- |
| Mathew Horne | Gavin 'Gav' Shipman | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Joanna Page | Stacey 'Stace' Shipman née West | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| James Corden | Neil 'Smithy' Smith | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Ruth Jones | Vanessa 'Nessa' Jenkins | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Rob Brydon | Brynfor 'Bryn' West | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Larry Lamb | Michael 'Mick' Shipman | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Alison Steadman | Pamela 'Pam' Shipman | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Melanie Walters | Gwen West | 13 May 2007 | 1 January 2010 | 2007–2010 | 20.0 |
| Steffan Rhodri | David Coaches | 13 May 2007 | 1 January 2010 | 2007, 2008–2010 | 11.0 |
| Sheridan Smith | Ruth 'Rudi' Smith | 16 March 2008 | 1 January 2010 | 2008–2010 | 7.0 |
| Margaret John | Doris | 13 May 2007 | 1 January 2010 | 2007, 2008, 2009, 2010 | 8.0 |
| Adrian Scarborough | Pete Sutcliffe | 13 May 2007 | 17 December 2009 | 2007–2009 | 7.0 |
| Julia Davis | Dawn Sutcliffe | 13 May 2007 | 17 December 2009 | 2007–2009 | 7.0 |
| Robert Wilfort | Jason West | 3 June 2007 | 1 January 2010 | 2007, 2008, 2009–2010 | 6.0 |
| Huw Dafydd | Neil Jenkins | 26 November 2009 | 1 January 2010 | 2009–2010 | 3.0 |
| Pam Ferris | Cath Smith | 26 November 2009 | 17 December 2009 | 2009 | 2.0 |
| Steven Meo | Owain Hughes | 26 November 2009 | 10 December 2009 | 2009 | 3.0 |
Question:
What is the highest total number?
Answer:
20.0