1. If i leave the "upgrade Schedule" unchecked does that mean it installs immediately or not at all?
If there is no schedule it may start Immediately, it also depends on the client communication wiht the SEPM.
2. The "Distribute upgrades over" Does 0 days mean immediate or mean today? if I change it to 1 does it mean today or by tomorrow?
Specifies the number of days or hours over which the packages can be distributed. The following formula calculates time:
(Package Size\Server Transfer Rate) * Number of Computers
as
MB / MB per second * Num = seconds