The term 'DURING WHICH' can be solved by the six letter word 'WHILST'. This is an archaic form of the word 'WHILE', which is used to indicate a period of time in which something else is happening. It is often used to describe a situation in which two events are occurring simultaneously. For example, one might say 'I was eating dinner during which the phone rang'. In this sentence, the speaker is indicating that they were eating dinner at the same time that the phone rang.