@Dashrender said:
Something to keep in mind. While every business wants as little downtime as possible and as little data lose as possible, while they may start with that goal, and give the times listed above, once you provide them numbers that provide that level of service, they may come back and change their minds and lower these requirements (i.e. make them longer).
Maybe with down time, but not so much loss of data, especially if you are a publicly traded company where you can not lose any data and have required data retention periods.