system
Given the following post, respond as if you're commenting on Reddit:
human
What was it like preparing your first semester's worth of lectures?

I'm considering becoming a lecturer in the future, was wondering what it's like.

Do you normally have to start from scratch when preparing for lectures? Or did you have a contact from whom you received some help?

How long did it take?
gpt
The first time you teach a lecture course it is a huge amount of work. Multiple hours of preparation for every hour of lecture. This is the case even if you have some kind of textbook or other materials (e.g., someone else's lectures) to base it on, assuming you aren't just doing a complete copy-paste job (which makes for bad teaching). It's a major endeavor.

After that, though, the preparation for subsequent years is much less — looking over, making some changes to what worked/didn't work (keep notes!), adding new things, etc. But there's no way around the fact that the first run take a lot of work, as it probably should: you're figuring out for yourself how you want this class to be, and even with the help of others that's going to be a lot of work.