Originally Posted by Boss-Hog
I'm not sure exactly when - it just says per 24 hours, so presumably from the time you use your first rating.
There is a date stamp for each reputation ranking you do. So the system will check this field, make sure it meets the requirements set by you guys and then will add the reputation ranking to the system.
I noticed if you click on the Add reputation link for yourself, it tells you your score thus far.