How does the data query limitation/restriction work?

Hello,

I am trying to collect some data about ESG and other information including Analyst Revisions ranking and Relative Value rank through Python API. In the morning of 07/10/2019, I successfully pulled out data for 4,000 symbols, which is part 1. Then I started part 2, which includes around 2500 symbols. I got no data after 1826 symbols. Please see the attached file for result.

I know there is some limitation for data query, so I waited until 5PM 07/10/2019 and ran the same query on the 2500 symbols, I still couldn't pull out data after 1826 symbols.

I waited until next morning, which is 9AM 07/11/2019, I still got the same results.

I am wondering about how the limitation works? In my case, how long should I wait between part 1 symbols and part 2 symbols?

Thank you!