Table:
text: List of Belgian Football League managers
Managers
Managers
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

text: List of Belgian Football League managers
Managers
Managers
Name_ Date_of_birth Club Division Appointed Time_as_manager_
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

text: List of Belgian Football League managers
Managers
Managers
Name_ Date_of_birth Club Division Appointed Time_as_manager_
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

text: List of Belgian Football League managers
Managers
Managers
Name_ Date_of_birth Club Division Appointed Time_as_manager_
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

text: List of Belgian Football League managers
Managers
Managers
Name_ Date_of_birth Club Division Appointed Time_as_manager_
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 many managers were there in the list of Belgian Football League managers in total?