The most recent 5 female studio albums to have the "4 or more consecutive weeks at #1" title
2007: Koda Kumi - "Black Cherry" (4 weeks)
2000: Hamasaki Ayumi - "Duty" (4 weeks)
1997: Ohguro Maki - "POWER OF DREAMS" (4 weeks)
1990-1991: Princess Princess - "Princess Princess" (5 weeks)
1988: Watanabe Misato - "ribbon" (4 weeks)
http://www.oricon.co.jp/news/rankmusic/41238/
Also, Hikki's SINGLE COLLECTION went 4 consecutive weeks at #1 in 2004.