Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/RETAINED/CPU_WAKEUPTIME#0x0
CPU_WAKEUPTIME register
(Absolute) Target time to wakeup the CPU.
https://github.com/modm-io/cmsis-svd-stm32