BCGControlBar Pro for MFC
UINT CBCGPDockManager::g_nTimeOutBeforeDockingBarDock

Specifies the time out before a docking control bar is docked in immediate docking mode.

When a docking control bar is in the immediate docking mode and the framework determines that the control bar should be docked, it waits the specified amount of time giving the user an ability to move the control bar to another place without docking.