Airline: VA/day (Max days), Train/day (S/L), Reserve/day (movable days dom/int'l)
AAL: 3:40 (31), 4:00/4:13, 4:03/4:22 (1-2/1-2)
DAL: 3:30 (35), Credit/4:00, 4:00/4:44 (6-8/6-8)
UAL: 3:15 (42), 3:00/3:45, 4:03/4:22 (1/6-7)

4:00 (42), 4:00/5:00, 4:15/4:30 would set a good standard (4 x 30 days = 120 hours/month).