How far can flaming sphere move from its caster?

[Kodyboy1701]

How far can flaming sphere move from its caster?

[Aratorin]

30 feet. The sphere must stay within Range at all times.

[thenobledrake]

Aratorin is correct, as the spell text says "On subsequent rounds, you can Sustain this Spell, leaving the sphere in its square or rolling it to another square within range..."