Solo female vocalist:
Adele: 24 weeks
Rihanna: 19 weeks
Taylor Swift: 14 weeks
Katy Perry: 11/16 weeks (not sure about ET)
Kesha: 10 weeks
Carly Rae Jepsen: 9 weeks
Lorde: 9 weeks
Meghan Trainor: 8 weeks
Lady Gaga: 6 weeks
Solo male vocalist:
Bruno: 29 weeks
Pharrell: 10 weeks
The Weeknd: 9 weeks
Justin Bieber: 6 weeks
Omi: 6 weeks
10 weeks on your own is no f**kin joke these days, 20+ is insane.