I can not believe this thread!! Time keeping to the nearest minute. What sort of a person would tell someone that they will arrive at 10:56 really that is so lame. What is wrong with 10:56 and 23 seconds. Hello.
To not use the 60, yes 60 seconds available to you when letting people know what you are doing is simply the height of laziness.
Get a grip people and take some pride in your timekeeping after all we pilots have big watches, lets use them.