Short for "time to payout", "term to payout" or "payout period".
In terms of financial securities like annuities and dividends, payouts refer to the amounts received at given points in time. For example, in the case of an annuity, payouts are made to the annuitant at regular intervals such as monthly or quarterly. With dividends, payouts are made by corporations to their investors and can be in the form of cash dividends or stock dividends.
Investment dictionary. Academic. 2012.