Regional airlines generally do not fly red eyes, so it won’t be much of an issue there. The majors fly plenty of red eyes, every flight to Europe is a redeye, plus there is a large amount of domestic red eyes. Airlines are a 365, 24/7 operation, regardless of your seniority you will have duty hours all over the clock.
It might be possible to work hard and complete the program ahead of schedule, but remember that the reason for the increased timeline is FAA checkride availability, not ATP or the students. I would plan on it taking the whole time and be pleasantly surprised when you finish it in less time.