timing
tim.ing n 1: selection for maximum effect of the precise moment for beginning or doin g something 2: observation and recording (as by a stopwatch) of the elapsed time of an act, action, or process
Webster's English Dictionarytim.ing n 1: selection for maximum effect of the precise moment for beginning or doin g something 2: observation and recording (as by a stopwatch) of the elapsed time of an act, action, or process