The Gate spell: How does it work in PFS?
You drop the 10,000 gold in incense (or burn a Candle of Invocation for 8400 GP). You call out the kind of creature you want with an HD up to your own to control. The portal opens. Out pops the being and you let the portal close.
"...If you choose to call a kind of creature instead of a known individual, you may call either a single creature or several creatures. In either case, their total HD cannot exceed twice your caster level. In the case of a single creature, you can control it if its HD does not exceed your caster level. A creature with more HD than your caster level can't be controlled. Deities and unique beings cannot be controlled in any event. An uncontrolled being acts as it pleases, making the calling of such creatures rather dangerous. An uncontrolled being may return to its home plane at any time..."
How long do you get to control the creature for? Rounds per level? Hours per level?
From the wording of the second part of the spell, you can choose to make a more complicated or extended deal per lesser planar ally; but what is considered the standard arangement that is paid for by the casting and calling?