Ask HN: Compensation packages for technical advisors?

I'm considering taking an advisory role with a funded, well-known start-up. Specifically I will be advising their operations group as they scale their service (which is my expertise).

They want me to commit 10 hours per month, including 2x 1-1.5 hour meetings (one telephonically, one face to face).

What is typical compensation for this? And what are the added perks for an advisor beyond stock options?