What is your workflow?
(10 hours is a large chunk!)
When I took him on, my flow's been this: I do as much work as I can, get stuck, then he's there to pull me out of the mess I made. I learn a ton along the way, and he'll point out topics for me to research on my own.
10 hours is a large chunk, but it's lasted a full 2 months with probably a good month left in it. This project edits some PhysX engine code for an Unreal Engine-based game I'm making. The level of technical depth in it is beyond anything I've done before, so I pulled out the stops for it.
You have him -- more or less -- on call when you get stuck for 30 minutes at a time?
Or do you batch all the roadblocks you have, then ask him to schedule something at, say 10am, the next day. He looks at your git repo and the issues you have?