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:
| Team | Outgoing manager | Manner of departure | Date of vacancy | Replaced by | Date of appointment | Position in table |
| --- | --- | --- | --- | --- | --- | --- |
| Manchester City | Stuart Pearce | Contract terminated | 14 May 2007 | Sven-Göran Eriksson | 6 July 2007 | Pre-season |
| Chelsea | José Mourinho | Mutual consent | 20 September 2007 | Avram Grant | 20 September 2007 | 5th |
| Bolton Wanderers | Sammy Lee | Mutual consent | 17 October 2007 | Gary Megson | 25 October 2007 | 19th |
| Tottenham Hotspur | Martin Jol | Contract terminated | 25 October 2007 | Juande Ramos | 27 October 2007 | 18th |
| Wigan Athletic | Chris Hutchings | Contract terminated | 5 November 2007 | Steve Bruce | 26 November 2007 | 18th |
| Birmingham City | Steve Bruce | Wigan purchased rights for £3m | 19 November 2007 | Alex McLeish | 28 November 2007 | 15th |
| Derby County | Billy Davies | Mutual consent | 26 November 2007 | Paul Jewell | 28 November 2007 | 20th |
| Fulham | Lawrie Sanchez | Contract terminated | 21 December 2007 | Roy Hodgson | 30 December 2007 | 18th |
| Newcastle United | Sam Allardyce | Mutual consent | 9 January 2008 | Kevin Keegan | 16 January 2008 | 11th |
| Chelsea | Avram Grant | Contract terminated | 24 May 2008 | Luiz Felipe Scolari | 1 July 2008 | Post-season (2nd) |
| Manchester City | Sven-Göran Eriksson | Mutual consent | 2 June 2008 | Mark Hughes | 4 June 2008 | Post-season (9th) |
| Blackburn Rovers | Mark Hughes | Manchester City purchased rights for £4.6m | 4 June 2008 | Paul Ince | 22 June 2008 | Post-season (7th) |
Question:
avram grant was with chelsea for at least how many years?
Answer:
1