SBS 1977 B Duty 4S, then driver goes for swing break after 0930hrs.
Duty 6T driver reports for work - same bus. Does 119 then 578 after
1330hrs.
SBS 2782 P Duty 3P, driver reports to work as S578 then
does 119 after 1715hrs till night.
So 1977B rests at 0930hrs and resume 119 at what time until
1330hrs before doing 578?