The list of available TV windows are based on media websites, TV listings and press releases. They can change based on the needs of the broadcaster or the conference.
Here's what I guessed based on the available openings (they will prove to be incorrect) and here is the current schedule for the week as several FBS games do have their time & television/webcast assignments already accounted for.
The number of six day holds available for each conference
ACC: 3 (one used on 10/6)
Big 12: 4
Big Ten: 3 (one potentially being used on 10/13)
Pac-12: 3 (10/6 by FOX)
12pm ABC or ESPN2: Nebraska at Northwestern
12pm ABC or ESPN2: Iowa at Indiana
12pm ESPN or SEC Network: Tennessee at Auburn
12pm ESPN or SEC Network: Florida at Vanderbilt
12pm FS1 or BTN: Minnesota at Ohio St.
12pm FS1 or BTN: Rutgers at Maryland
12pm ESPNU: Oklahoma St. at Kansas St.12pm CBSSN: Akron at Buffalo
12pm ESPN+: Toledo at Eastern Michigan
12:20pm ACC Network: Duke at Georgia Tech
12:30pm ACC RSNs: Louisville at Boston College
2:30pm ESPN+: Kent St. at Miami (OH)
3pm ESPN3: Ball St. at Central Michigan
3:30pm CBS: Georgia at LSU
3:30pm ABC/ESPN/ESPN2: Washington at Oregon
3:30pm ABC/ESPN/ESPN2: Baylor at Texas
3:30pm ABC/ESPN/ESPN2: UCF at Memphis
3:30pm FS1 or BTN: Michigan St. at Penn St.
3:30pm FS1 or BTN: Purdue at Illinois
3:30pm ESPNU: Army vs. San Jose St.
3:30pm SEC: Texas A&M at South Carolina
3:30pm ESPN+: Ohio at Northern Illinois
6pm ESPN3: UL-Monroe at Coastal Carolina
7pm ESPN: Missouri at Alabama
7pm ESPN2/ESPNU: Miami (FL) at Virginia
7pm ESPN2/ESPNU: Virginia Tech at North Carolina
7pm FS1: West Virginia at Iowa St.
7pm CBSSN: Houston at East Carolina
7pm Pac-12: UCLA at California
7:30pm ABC: Wisconsin at Michigan
7:30pm SEC: Ole Miss at Arkansas
10:15pm ESPN2: Hawai'i at BYU
10:30pm FS1: Colorado at USC
10:30pm ESPNU: Wyoming at Fresno St.