Searchers routinely ask some variation of these questions:
"How many search results is a good number to have?"
"I got 47 search results. Is that enough?"
"I have 2800 search results. Is that too many?"
The highly unsatisfying answer is, IT DEPENDS.
What are you working on? Systematic reviews and scoping reviews, for example, need sensitive searches--comprehensive searches that attempt, as near as possible, to identify all relevant articles. On the other hand, a class assignment on a topic may only require a specific search--a search that attempts to identify a set of highly relevant articles, and which will likely yield a smaller number of search results.