FcConfigGetRescanInterval - Get config rescan interval
#include <fontconfig/fontconfig.h>
int FcConfigGetRescanInterval (FcConfig *config);
Returns the interval between automatic checks of the configuration (in seconds)
  specified in config. The configuration is checked during a call to
  FcFontList when this interval has passed since the last check. An interval
  setting of zero disables automatic checks. If config is NULL, the
  current configuration is used.