Simplify duration cast #8570

Job	Run time
mingw (ucrt64)	3m 53s
mingw (mingw64)	3m 55s
build (windows-2022, Win32, v142, 17, Release)	2m 18s
build (windows-2022, Win32, v142, 17, Debug)	1m 59s
build (windows-2022, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 22s
build (windows-2022, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 19s
build (windows-2022, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 11s
build (windows-2022, x64, v142, 17, Release)	2m 26s
build (windows-2022, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 15s
build (windows-2022, x64, v142, 17, Debug)	1m 26s
build (windows-2022, x64, v143, Debug, 20)	2m 6s
build (windows-2022, x64, v142, 20, Debug)	1m 36s
build (windows-2022, x64, v142, 20, Release)	2m 50s
	29m 36s

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