Even though I really prefer playing fighters against people and I don't have too many people over I still manage to pull about 3 hrs a week or so on my Neo with various games, mostly MotW, LB2, or KoF 96/99. Honestly I play my DC more with CvS or SF3 3rd Strike and soon the PS2 will steal time from everything as I am a heavily addicted Tekken player, too bad that is the only good game on the system so far.
I used to be more addicted to my Neo though, playing a good hour and a half to four hours a day depending on school, work, and NHL schedules.