The term 'not much time' can be broken down into three crossword solutions: SECONDS (7 letters), NANOSECOND (10 letters), and millisecond (11 letters). SECONDS are the most commonly used unit of time, representing one sixtieth of a minute. Nanoseconds are one billionth of a second, and are used to measure very short intervals of time. Milliseconds are one thousandth of a second, and are often used to measure the response time of computer systems.