Fix/getMaxDuty #1022

Job	Run time
build (macos-latest, esp8266, gcc)	54s
build (macos-latest, host, gcc)	16m 51s
build (macos-latest, rp2040, gcc)	13m 56s
build (ubuntu-latest, esp8266, gcc)	1m 4s
build (ubuntu-latest, host, clang, Host)	18m 27s
build (ubuntu-latest, host, gcc)	17m 30s
build (ubuntu-latest, host, gcc64, Host)	17m 19s
build (ubuntu-latest, rp2040, gcc)	13m 43s
build (windows-latest, esp8266, gcc)	2m 29s
build (windows-latest, host, gcc)	18m 4s
build (windows-latest, rp2040, gcc)	6m 26s
	2h 6m 43s

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