How long does it take for you to prepare for job switch?

It could take anywhere from a few weeks to 4-5 months. For data engineering or data analyst roles, there aren't any good unified resources like LeetCode for software engineers, but there are several places where you can prepare. Websites like Kaggle and DataCamp offer resources that are helpful in data analysis and engineering skills. You should also focus on improving your knowledge of SQL and Python as these are commonly used in data roles. Additionally, understanding data warehousing concepts and big data technologies like Hadoop and Spark will be important if you want to work in a company at scale. PySpark is also a great consideration.