Play through X amount of days to unlock listed track in arcade mode:

Deep Forest Raceway - Days Completed = 15
Opera Paris - Days Completed = 29
Fuji Speedway 80s - Days Completed = 43
Special Stage Route 5 - Days Completed = 57
Suzuka Circuit - Days Completed = 71
Twin Ring Motegi Road Course East Short - Days Completed = 85
Grand Valley Speedway - Days Completed = 99
Hong Kong - Days Completed = 113
Suzuka Circuit West Course - Days Completed = 127
Fuji Speedway 2005 GT - Days Completed = 141
Ice Arena - Days Completed = 155
Apricot Hill Raceway - Days Completed = 169
Cote d Azur - Days Completed = 183
Tahiti Maze - Days Completed = 197
Twin Ring Motegi Road Course - Days Completed = 211
George V Paris - Days Completed = 225
Cathedral Rocks Trail I - Days Completed = 239
Costa di Amalfi - Days Completed = 253
Circuit de la Sarthe 1 - Days Completed = 267
Autumn Ring - Days Completed = 281
Infineon Raceway Stock Car Course - Days Completed = 309
Circuit de la Sarthe 2 (Unchicaned) Days Complete = 351
Tsukuba Circuit Wet Days Complete = 337
Fuji Speedway 2005 F Days Complete = 323
Chamonix Days Complete = 309