Fix timestamp codec len calculation #7571

Job	Run time
Typos Check	5s
Typos Check	5s
Lints and doc tests on ubuntu-latest	12m 38s
Lints and doc tests on ubuntu-latest	12m 38s
Unit tests on ubuntu-latest	17m 25s
Unit tests on ubuntu-latest	17m 25s
Unit tests on windows-latest	20m 33s
Unit tests on windows-latest	38m 26s
Lints and doc tests on windows-latest	17m 46s
Lints and doc tests on windows-latest	17m 46s
Lints and doc tests on macos-13	15m 54s
Lints and doc tests on macos-13	15m 54s
Unit tests on macos-13	17m 32s
Unit tests on macos-13	17m 32s
Unit tests on macos-14	11m 34s
Unit tests on macos-14	11m 34s
Lints and doc tests on macos-14	9m 53s
Lints and doc tests on macos-14	9m 53s
Memory leak checks	2m 24s
Memory leak checks	2m 24s
CI status checks	1s
CI status checks	1s
	4h 29m 23s

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