the director will be out of the country until next month, during which time the assistant will take charge of ongoing projects
the time이 아니고 왜 which time 인가요?

 

the assistant will take charge of ongoing projects during the time 원래 이렇게 되는건데

 

next month를 꾸밀려고 during which time이 앞으로 나온 건가요?