Dr. Pepper: Yes and yes.
I didn’t necessarily have a mean and variance in mind, but you <i>could</i> use a variance of between 1 second and 30 minutes.
(Also notice Plan B is really 2 plans, the second one being with a 30-second minimum.)
You could describe the savings in terms of time (i.e. seconds per call saved compared to the competing plans) and money (which in effect is the same thing being described monetarily instead of time.)