CONFIG_TIME_BOOTUP is not available for thedefaultarchitecture x86.
Result is shown for architecture v850
default or selected kernelversion does not have config value CONFIG_TIME_BOOTUP.
Result is shown for kernelversion 5.19-rc1
Time bootup
configname: CONFIG_TIME_BOOTUP
uClinux/v850 (w/o MMU) Kernel Configuration
└─>Processor type and features
└─>Time bootup