I'll start with the public policy spiel: the fastest class 3 electric bikes max out at 45 kph (28 mph), meant to be just below where mopeds max out at 30 mph, then after that, other, faster two wheeled machines that require licensure and insurance. Proceed with care with the advice you receive. At the very least, please don't tailgate cyclists or pass them aggressively or too closely, and don't ride on bike paths. OHV tracks will probably be more fun anyway.
Ok, with that out of the way, there are some technical challenges you'll face. For reference, a dual battery Bikonit MD750 ebike with the speed governor raised to its maximum 60 kph will run at full speed to empty in approximately 32-35 kilometers (20-22 miles). Allegedly.
That particular electric bike has a 750 W motor and a pair of 700 Wh battery packs, each weighing 4 kg, give or take. So that's 1.4 kWh for 35 kilometers, if we're being optimistic.
Your build seeks to attain 56 kilometers one way, but let's round up to 70 km for reserve capacity. If you're able to charge at work, then that puts your energy requirement at some 3 kWh, which is a lot of battery. This will also be 16 kg (35 lbs) on its own, which has implications on your bike's frame and suspension.
Now, if you ran slower than max speed, the requirements drop substantially. The same MD750 above is good for 80-100 km when run at only 30-40 kph. But it sounds like you're looking for a one hour commute each way.
In that case, I would suggest you reexamine the electric motorbike, as they have the advantage of being prebuilt, already have the necessary capacity, take standard motorbike accessories, and have a much taller max speed, if you so choose. Some even have removable batteries, to bring it into your workplace and charge indoors.
Price of an electric motorbike, of course, may be higher than building your own electric bicycle. But the amount of battery cells in question is substantial and much care in design would be needed. The finished product would likely also be somewhat conspicuous, versus a stock electric motorbike. But this may be a function of whether your workplace has secure indoor parking.
I love seeing what people will build and ride on two wheels, and many will necessarily push the envelope on what's appropriate around their area. Proceed with care.