From neogaf
Number of weeks it took the following systems to drop below 10.000 units: (Famitsu)
PS2 - 402 (week 39 and 40 it sold 8.136 and 3.306 units respectively due to supply issues)
PSP - 394
NDS - 337
Wii - 224
GBA - 214
PS3 - 27
PSV - 17
Wii U - 12
Xbox 360 - 5
GCN - 5
Xbox - 4
3DS - 24 (week before price drop)








