I know that "use of a power" qualifies, but what about skills? If I tell a sprite to simply operate a node (like a Machine Sprite operating a drone) that would seem like an open ended "use of power" that could last indefinitely.

Also, are Sprites limited by the nodes they occupy? If I load a r6 Sprite on a r3 node, does it function as a r3 Sprite?

1) The sprite should use whatever skills at its disposal in order to perform the task you have appointed it, just like spirits.

2) As far as I know... no. Because Resonance.