By looking at the uci option file of Stockfish 10 I found this line:
o["nodestime"] << Option(0, 0, 10000);
How exactly does one use nodestime?
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has everything you need. Essentially, it's an option for chess engine testing, not for production use. The option ensures the engine plays perfectly equally during development.
As a user, you shouldn't bother with this option because number of nodes per ms is not something easy to give a value.