I had WAY too much time on my hands, and I re-watched Season 11 and transcribed all of the confessionals, judges/coaches commentary, and other assorted details. It will take me awhile to organize it all, but I was thinking of eventually making a Wiki for the show (hopefully adding the other seasons eventually), since people always seem to ask questions about which seasons so-and-so was on, etc. In the meantime, here's the final confessional count from Season 11.
33 – Kelsey L
21 – Kyndall
20 – Amy A
18 – Tasha
15 – Emily
15 – Maddie
14 - Maggie
10 – Jackie
9 – Allie
9 – Bethany
9 – Brennan
9 – Heather O
8 – Katie
8 – Mandy
8 – Sheridan
8 – Whitney
8 – Yuko
7 – Celinda
7 – Jinelle
7 – Kelli
7 – Royesha
6 – Heather H
6 – Milan
5 – Cersten
5 – Jenna [S6 rookie]
5 – Kat
4 – Jessika
4 – Khalyn
4 – Kylee
3 – Caila
3 – Holly P
3 – Jennifer A
3 – Lindsey
2 – Emma Mary
2 – Holly Arielle (former)
2 – Megan
1 – Jacie (former)
1 – Jaclyn
1 – Jessica
1 – Jordan Chanley (former)
1 – KaShara
1 – Melissa
1 – Robin
1 – Sasha Agent (former)
1 – Simone
1 – Tia Williams (former)
0 – Claire
0 – Danielle
0 – Erica
0 – Jenna Lene
0 – Lacey
0 – Selina (Despite being a rookie)
0 – Tess (Despite being a rookie)
0 – Amy L (Invisible)
0 – Amy T (Invisible)
0 – Chantel (Invisible)
0 – Raylee (Invisible)
0 – Stephanie (Invisible)
Yuko may seem low, but that's just because nearly all of her content is third-person commentary. Also, Selina's name is somehow spoken only once all season despite her being a returning TCC who was cut on the last night of TC the previous season.