Implement Timer #465

Job	Run time
rust_ci (macos-latest, stable)	1m 21s
rust_ci (macos-latest, beta)	1m 24s
rust_ci (macos-latest, nightly)	1m 27s
rust_ci (ubuntu-latest, stable)	1m 52s
rust_ci (ubuntu-latest, beta)	1m 53s
rust_ci (ubuntu-latest, nightly)	1m 53s
rust_ci (windows-latest, stable)	6m 12s
rust_ci (windows-latest, beta)	4m 41s
rust_ci (windows-latest, nightly)	3m 48s
	24m 31s

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