Just taking an arbitrary time of 7:30 am and saying that anything within 30 minutes of that is the normal time that people usuallt get out of bed, would you consider yourself, either by preference or necessity (i e early job/classes/exercise routine, ets) an early riser or a late riser.
And for the sake of this discussion, "rising" means up, fylly dressed, and ready to start the day, not lying in bed or on a sofa reading, writing, or surfing the net.