The term 'TO THE TIME WHEN' can be expressed in two words: 'UNTIL' and 'TILL'. 'UNTIL' is a preposition that means up to the time of or before (a specified time). It is usually used with a verb in the negative form, such as 'I will not leave UNTIL tomorrow.' 'TILL' is a synonym for 'UNTIL' and is also used to refer to a specific point in time. For example, 'I will stay TILL the end of the day.' Both words are used to indicate that something will happen up to a certain point in time.