It states this spell can affect 1 or more creatures but doenst give a range. How many creatures can I try to use this spell on? All creatures that are somewhat close to me?
The formula "no two of which can be more than 30' apart" is the same as a circle with 30' diamater, except that it excludes the spell's area from being modified by metamagic. You could double the radius of a circle that way and the devs didn't want that for many spells.