Each member of the retirement board who is in active service with the police department of a city as either a police officer, as defined in section 86.900, or as an employee, as defined in section 86.1310, shall be granted authorized leave with pay by such police department to attend any and all educational seminars and like functions that have been authorized by the retirement board, including travel time to and from such functions, not to exceed ten days in any calendar year. Leave granted under this section shall not reduce vacation or other authorized leave time to which such member may be entitled without reference to this section.