Add more margin to timer test #636

Job	Run time
rust_ci (ubuntu-latest, beta)	53s
rust_ci (macos-latest, stable)	1m 8s
rust_ci (ubuntu-latest, stable)	1m 9s
rust_ci (windows-latest, beta)	1m 47s
rust_ci (windows-latest, stable)	1m 45s
rust_ci (macos-latest, beta)	55s
	7m 37s

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