Otiluke's Freezing Sphere: The action cost for throwing the delayed action sphere.
Otiluke's Freezing Sphere spell has two ways of using it: the first is a classic elemental detonation at rangee. The second way is as follows:
>You can refrain from firing the globe after completing the spell's casting. If you do so, a globe about the size of a sling bullet, cool to the touch, appears in your hand. At any time, you or a creature you give the globe to can throw the globe (to a range of 40 feet) or hurl it with a sling (to the sling's normal range). It shatters on impact, with the same effect as a normal casting of the spell. You can also set the globe down without shattering it. After 1 minute, if the globe hasn't already shattered, it explodes.
I've got two questions on this:
What is the action cost of throwing the orb? An action? An attack? Could a 20th level fighter throw four of these in one round?
At any time - does this have any bearing on out of turn actions? Does this phrase have any meaning elsewhere in the rules?