As a newbie you can report posts as long as you wait for 10 minutes between each action.
The maximum wait time is 6 minutes, not 10 minutes
while if you have up to 15 activities, it takes you 1 minute 30 seconds to make another post
If your activity is 15, your wait time would be 75, not 90.
And for other ranks or with higher activities it takes at least seconds to make another post, I'm not sure how many exactly.
The minimum wait time users can have is 4 seconds and for that, you need minimum of 500 activity.