Let’s make the question more specific: what is the minimum distance in geostationary orbit between artificial satellites? The position of satellites in the geostationary orbit by active methods can be maintained in longitude with an accuracy of no more than 0.1 °, which corresponds to a distance in this orbit of about 150 km. The accepted distance in practice is 200 km. It makes no sense to count the number of satellites in a geostationary orbit, since not all parts of the orbit are actively used.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.