I agree, in this day, 45 hours is a little low. But then again, long power reserves have their own problems. Once you go past the 48 hour marker, there are a few problems to encounter such as twisting of the barrel springs, placement, and you start seeing big amplitude variance. So anything past about 48 hours requires other regulators to compensate for that. Also, the vph is running at 28,800, they could slow it down to 21,600 to preserve the power reserve, but maybe the balance wheel is too small for that. The slower you go, the bigger balance wheel you should have for optimum rate stability and higher inertia. A smaller wheel is more susceptible to shocks, but if it beats quickly, it'll average out any shocks and return to normalcy quicker. So if you had a slow beat and a small balance wheel, then that'd be a bad and bad combination. Personally I like big balance wheels with slow beats. I suppose a big balance wheel at a fast beat would be best, but that's not possible since something that big can spin that fast, it's too violent.
Totally agree with you on the wording on the dial.