timeit for debug> timeit {flags} (command)
command: the command or block to run| input | output | 
|---|---|
| any | duration | 
| nothing | duration | 
Times a command within a closure
>timeit { sleep500ms }
Times a command using an existing input
>http gethttps://www.nushell.sh/book/|timeit { split chars }
Times a command invocation
>timeitls-la
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    https://www.nushell.sh/commands/docs/timeit.html