Not to mention being behind Eli Manning who has missed exactly 0 starts in his entire career.
It really is remarkable how the Manning brothers where both iron-men. Consecutive Games Started for QB's (All-time rank - Reg Season Games - Playoff Games - Total):
1 - Brett Favre - 297 - 24 - 321
2 - Peyton Manning - 208 - 19 - 227
3 - Eli Manning - 199 - 12 - 211
To eclipse Peyton, Eli needs to just start every game in the 2017 season (seems likely) and either: start in one playoff game (possible) in 2017, or, start the first game of 2018.
To eclipse Brett, Eli needs to start every game for the next 6 seasons and to accumulate 14 more starts. The 14 games could come in the 7th season, or through playoff games (fingers crossed). In other words, at a minimum, he needs to play until he's 42 years old, starting every game and winning at least 2.33 playoff games a season along the way. Crazy talk.
Brett was superhuman. Mad respect.