BFD777
Basically the schedules are split between morning and afternoon departures. The morning departures all leave from 7:00-7:30 while afternoon departures leave anywhere from 13:00-15:00.
If you work the in the morning expect to be back around 13:00 while the afternoon slots will get you back late evening.
It's feasible to live in BKI and have a crash pad in KL but don't expect too much time off after starting line flying. The airline is expanding in a big way and with the new hub in Johor opening up there won't be too much free time.
Commuting to and from the airport is a slight pain in the behind though. Some drive to work while others take the excellent train which gives staff discount. The train runs from 05:30 till 01:00 and beats taking the car after a long day!
Hope this helps.
Goldwing2000