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:
| Name | Date of birth | Club | Division | Appointed | Time as manager |
| --- | --- | --- | --- | --- | --- |
| Francis Bosschaerts | 15 October 1956 | Heist | Belgian Second Division | 1 June 1999 | 15 years, 25 days |
| Peter Maes | 1 June 1964 | Lokeren | Belgian Pro League | 20 May 2010 | 4 years, 37 days |
| Hein Vanhaezebrouck | 16 February 1964 | Kortrijk | Belgian Pro League | 6 June 2010 | 4 years, 20 days |
| Frederik Vanderbiest | 10 October 1977 | Oostende | Belgian Pro League | 15 February 2011 | 3 years, 131 days |
| Arnauld Mercier | 4 June 1972 | Boussu Dour | Belgian Second Division | 21 April 2011 | 3 years, 66 days |
| Frank Defays | 23 January 1974 | Virton | Belgian Second Division | 6 June 2011 | 3 years, 20 days |
| Serhiy Serebrennikov | 1 September 1976 | Roeselare | Belgian Second Division | 30 June 2011 | 2 years, 361 days |
| Regi Van Acker | 25 April 1955 | Hoogstraten | Belgian Second Division | 23 November 2011 | 2 years, 215 days |
| Francky Dury | 11 October 1957 | Zulte Waregem | Belgian Pro League | 30 December 2011 | 2 years, 178 days |
| Dante Brogno | 2 May 1966 | Tubize | Belgian Second Division | 26 February 2012 | 2 years, 120 days |
| Eric Franken |  | ASV Geel | Belgian Second Division | 20 March 2012 | 2 years, 98 days |
| John van den Brom | 4 October 1966 | Anderlecht | Belgian Pro League | 30 May 2012 | 2 years, 27 days |
| Tintín Márquez | 7 January 1962 | Eupen | Belgian Second Division | 6 July 2012 | 1 year, 355 days |
| Lorenzo Staelens | 30 April 1964 | Cercle Brugge | Belgian Pro League | 2 April 2013 | 1 year, 85 days |
| Dennis van Wijk | 16 December 1962 | Westerlo | Belgian Second Division | 29 April 2013 | 1 year, 58 days |
| Stanley Menzo | 15 October 1963 | Lierse | Belgian Pro League | 14 May 2013 | 1 year, 43 days |
| Yannick Ferrera | 24 September 1980 | Sint-Truiden | Belgian Second Division | 24 May 2013 | 1 year, 33 days |
| Guy Luzon | 7 August 1975 | Standard Liège | Belgian Pro League | 27 May 2013 | 1 year, 30 days |
| Jimmy Floyd Hasselbaink | 27 March 1972 | Antwerp | Belgian Second Division | 29 May 2013 | 1 year, 28 days |
| Philippe Médery |  | Visé | Belgian Second Division | 31 May 2013 | 1 year, 26 days |
| Felice Mazzu | 12 March 1966 | Charleroi | Belgian Pro League | 1 June 2013 | 1 year, 25 days |
| Stijn Vreven | 18 July 1973 | Lommel United | Belgian Second Division | 1 June 2013 | 1 year, 25 days |
| Michel Preud'homme | 24 January 1959 | Club Brugge | Belgian Pro League | 21 September 2013 | 0 years, 278 days |
| Lionel Bah | 2 February 1980 | WS Brussels | Belgian Second Division | 21 September 2013 | 0 years, 278 days |
| Guido Brepoels | 7 June 1961 | Dessel Sport | Belgian Second Division | 24 September 2013 | 0 years, 275 days |
| Čedomir Janevski | 3 July 1961 | Mons | Belgian Pro League | 27 September 2013 | 0 years, 272 days |
| Mircea Rednic | 9 April 1962 | Gent | Belgian Pro League | 1 October 2013 | 0 years, 268 days |
| Bob Peeters | 10 January 1974 | Waasland-Beveren | Belgian Pro League | 5 November 2013 | 0 years, 233 days |
| Rachid Chihab |  | Mouscron-Péruwelz | Belgian Second Division | 19 December 2013 | 0 years, 189 days |
| Franky Vercauteren | 28 October 1956 | Mechelen | Belgian Pro League | 5 January 2014 | 0 years, 172 days |
| Jean-Guy Wallemme | 10 August 1967 | RWDM Brussels | Belgian Second Division | 30 January 2014 | 0 years, 147 days |
| René Desaeyere | 14 September 1947 | Aalst | Belgian Second Division | 5 February 2014 | 0 years, 141 days |
| Emilio Ferrera | 19 June 1967 | Genk | Belgian Pro League | 24 February 2014 | 0 years, 122 days |
| Ivan Leko | 7 February 1978 | OH Leuven | Belgian Pro League | 25 February 2014 | 0 years, 121 days |
Question:
how long has frank defays served as manager?
Answer:
3 years, 20 days