How to explain why RL is difficult to someone who knows nothing about it?

I’ve been working on an RL project at work. The person who assigned it to me is a computer scientist who is not an expert on RL, but understands it’s a difficult problem. (My boss is on equal footing with the person who assigned the project to me. My boss is not a computer scientist and doesn’t know anything about RL.) This guys boss is a business manager who doesn’t know anything about RL and knows very little about ML. The business manager wants a report on how the project is going from me and I’m getting the sense that he doesn’t really understand why this is taking so long.

For context, I’ve been working on this project for about 4 months for 15 hours per week. In that time, I’ve built an entire code base for the problem from scratch and programmed up several models. I have one that mostly works at the moment, but I need to make some changes to the reward functions to get it performing well consistently. I’m the only one working on this project, so I’ve done all of this myself. I also had only done vanilla RL prior to this, so I’ve had to learn a ton about deep RL to make this work. Luckily I know someone who’s an expert in deep RL (outside work) and has been able to give me pointers. I’m feeling like I’ve made a ton of progress and am nearing the home stretch in terms of having a completely polished model. However I’m getting the sense that this guy is not super thrilled with me. This guy doesn’t have any official authority over me, so this is mainly about trying to explain how much work RL is in addition to mg normal slides about the project and where I’m at.