Well, depending on what you mean by "how much time", it could be many things. It takes 2 hours and 48 minutes to fly 1400 miles by plane, about 24 hours to drive 1400 miles nonstop at 60 mph, and about 20 days to walk 1400 miles nonstop.
1400 is the military and European version of 2:00 p.m.. The military and Europe operate on a 24-hour clock, where noon-onward is expressed as 1200-1300-1400, etc. '1400' is US Marine Corp phrasing, whereas the Army and Air Force would say '1400 hours.'
0600 is 6am 1400 is 2pm = 8 hours
24-hour time tells time as "hours since midnight," with midnight being 0 hour. 1400 (or 14:00), then, would be 14 hours since midnight. To translate a time later/bigger than 1200 into 12-hour time (times after 12 are PM), simply subtract 12 to make it p.m. In the case of 1400, that would be 2:00 p.m.
1400 hours = 1400/24 = 58.33... days. Given that a month can have 28 to 31 days, it is not possible to convert the number of days into an exact number of months but it is possible to say that it is a little short of 2 months.
Eight hours and 20 minutes, or 8.3333 hours, is 1400 minutes.
9:00 AM or 900 hours if you prefer
Distance = Rate X Time in this case Time = Distance/Rate = 3.6 X 10^7 miles/1400 mph = 25714.3 hours 24 hours in a day and ~ 30 days in a month = 720 hours in one month, so.... 25714.3/720 = ~ 35.7 months
Military time is the 24 hour clock. It was created to avoid any confusion between similar sounding times such as 2:00am and 2:00pm. If this was sent over a radio with bad reception for instance! This would be 0200 hours and 1400 hours in military time.