Here is the brief explanation on how to specify the delay time in transition effect in CSS3.
time - Specifies the number of seconds or milliseconds to wait before the transition effect gets started.
initial - Sets this property to its default value.
inherit - Inherits this property from its parent element.
The transition-delay property specifies a delay (in seconds) for the transition effect. The transition-delay property specifies the starting time of the transition effect. The transition-delay value is defined in seconds (s) or milliseconds (ms).