8 hours work normal because the worker divider in three different work time
8am to 4pm monday to friday
I understand this job nature is 24 hours must be standby.
If you work at the head office, working hours are 8-4 with 1 hour lunch (1/5 hr lunch is paid). Else where, some are 8 hr/day site but most are 24 hours site so it will be shift work.