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The answer is, as many as your search retrieves! You should not limit by date or any search terms unless they are specifically mentioned in your protocol.
Systematic reviews with 1000s of papers for screening are not unheard of, and should not be artificially reduced. In many cases, a Faculty Librarian may be able to help advise you on improving your search without reducing the sensitivity of the search.
It is also possible to set up Endnote or use services such as Rayyan to streamline the screening process, in a multi-stage 3 pass method such as title, abstract, and full-text screening which reduces the burden.
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