Here's another 747 FO's roster - blindline, one of the most junior on the fleet:
1
ff
2-6: JNB
7-8: Off
9-12: PEK
13-14: Off
15: Time Assignable (an ad-hoc stand-by of sorts; they need to notify you the evening before if they intend to use you; used to generate credit hours)
16: Off
17-21: GRU
22-24: Off
25-27: JFK
28-30: Off
HTH