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That's a pretty long ways, but if the light is not on when you start the car then it has synced to the TPMS. It takes about 20 miles or so of driving until the ECU rechecks for TPMS sync. That's when the TPMS light comes on and flashes a few times before going solid.
You noticed that when you leave work, the light stays on. If the car never finds the TPMS sensors (or a sensor is bad or you have low air in a sensor), the light will continue to stay on.
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