Hi there, how long are you allowed to visit for with a tourist Visa. Is it 30 days?

Usually, a single entry Tourist L has a duration of stay for 30 days. If you want to stay longer, you can try to apply for an extension in China.

Or if your already has a long time trave plan, you can also try to apply for a single entry with 60 days. The embassy has the final right to decide the duration the stay based on your documents.