Dagannoth Kings:
[spoiler]Assumptions: duo, 30 cycles per hour
Expected points per person (xPPP) from 8 hours: 6.43[/spoiler]
Chaos Fanatic:
[spoiler]Assumptions: solo, 40 kills per hour
xPPP from 8 hours: 5.38[/spoiler]
Callisto/Venenatis/Vet’ion:
[spoiler]Assumptions: solo, 20 kills per hour
xPPP from 8 hours: 5.00[/spoiler]
Chaos Elemental:
[spoiler]Assumptions: solo, 20 kills per hour
xPPP from 8 hours: 4.48[/spoiler]
Crazy Archaeologist:
[spoiler]Assumptions: solo, 40 kills per hour
xPPP from 8 hours: 4.29[/spoiler]
Scorpia:
[spoiler]Assumptions: duo, 45 kills per hour
xPPP from 8 hours: 2.68[/spoiler]
Kalphite Queen:
[spoiler]Assumptions: solo, 20 kills per hour
xPPP from 8 hours: 3.57[/spoiler]
Saradomin:
[spoiler]Assumptions: trio, 30 kills per hour
xPPP from 8 hours: 2.36[/spoiler]
Zamorak:
[spoiler]Assumptions: trio, 30 kills per hour
xPPP from 8 hours: 2.27[/spoiler]
Zulrah:
[spoiler]Assumptions: solo, 15 kills per hour
xPPP from 8 hours: 2.21[/spoiler]
Bandos:
[spoiler]Assumptions: trio, 30 kills per hour
xPPP from 8 hours: 2.04[/spoiler]
Armadyl:
[spoiler]Assumptions: trio, 20 kills per hour
xPPP from 8 hours: 1.48[/spoiler]
Corp:
[spoiler]Assumptions: 4 man, 25 kills per hour
xPPP from 8 hours: 1.38[/spoiler]
KBD:
[spoiler]Assumptions: solo, 20 kills per hour
xPPP from 8 hours: 0.94[/spoiler]
Lizard Shaman:
[spoiler]Assumptions: duo, 60 kills per hour
xPPP from 8 hours: 0.46[/spoiler]
Mole:
[spoiler]Assumptions: solo, 15 kills per hour
xPPP from 8 hours: 0.35[/spoiler]

You can adjust these based on your own personal situation. Team size assumptions can be directly adjusted, for example if you can solo Scorpia at 45 kills per hour simply double the 8 hour xPPP and it’ll be more accurate for you.  Likewise, if you are 4 manning Bandos at 30 kills per hour you just need to multiply its 8 hour xPPP by 3/4.
You can estimate kills per hour adjustments in the same manner but they won’t be as accurate, you should also regress your adjustment toward the original number by a little bit. If you can do 20 Zulrah kills per hour, for example, even though it’s a 33% increase in efficiency that only translates to 0.65 more xPPP per 8 hours, which is closer to a 29% increase. Likewise, if you can only get 20 kills per hour at Bandos that’s a 33% reduction in efficiency and a 27% reduction in xPPP per 8 hours.