Is there any limit to the amount of data that can be taken from a research paper for writing a review paper? I am writing a detailed literature review of some twenty papers available on a newer topic of interest, which form the core of the topic. I am extensively using data from all of those twenty papers.

I want to know whether there is any limit to the amount of data that can be  taken from a research paper (with proper citations and referencing) for writing a review paper. Will the excessive use of data (methodology,  experimental results, author's proposed and unverified hypothesis etc.) from a research paper be called plagiarism?
Plagiarism, according to Marriam-Webster, quoted here:


  
  to steal and pass off (the ideas or words of another) as one's own
  to use (another's production) without crediting the source
  to commit literary theft
  to present as new and original an idea or product derived from an existing source
  


From your description, it seems you are not committing any of these offenses. Review papers necessarily report large amounts of work and results from other researchers and are therefore, in a sense, derivative. This isn't plagiarism, as long as the sources are painstakingly referenced and acknowledged (as you do). The originality of a review consists in synthesising the existing body of work, identifying different strands in it, examining present shortcomings as well as best practices, and suggesting further research at the cutting edge.