Hi & welcome!
How often to water is dependent on so many factors that contribute to how fast the soil dries and how fast the plant uses moisture in those conditions, vetted against the size of plant and root system in relation to volume and type of soil. Like Ken's plants, I don't have any that go a month without a drink.
Is it true that if the pot is too big it won't grow? I don't think so at all. A huge volume of soil that takes a long time to dry out can cause roots to rot, but that has nothing to do with the size of the pot. For the fastest foliage growth, roots must be growing also, with space to do so. Jade is known as a slow growing plant, so fast growth would be relative to other Jade plants but not to something like a sunflower that can get 10+ feet tall in a single summer. Yours does seem especially slow. I would say it would prefer more light too, gradually. Suddenly sticking it right next to a window where the sun shines right on it for hours right away could cause sunburn (dead brown spots on leaves that don't heal like a human with sunburn.) I would move it closer to the window over the course of a few weeks, or even months.
