There is no rigid classification of tasks by deadlines, but you can get a general idea of some tasks:
a) control of the movement of people and/or machines can be integrated within 1-2 weeks; provided you have a sane IT service and security on your side
b) control of cash area: pilot phase (3-4 cameras) at least one month (timeframe for subsequent cameras is much shorter)
c) non-trivial cases, such as video analytics on the technological area in mechanical engineering, control in a casino with the identification of cheaters and qualification of their actions require at least several months.