Help please?

Hi =)

This is going to sound a little confusing, I will try to explain it as best I can.

I'm going to pray on bandits from 90-99 attack. I am 70 prayer. My Prayer bouns will be +11.

I'm wondering;

- How much exp I should get an hour here, roughly.
- How long it will take to 99 attack with this method.
- How many prayer pots I will use


My strength level is 90, I will be using a whip.


Anybody that can figure this out, I greatly appreciate it =)