This is the 6226th most frequent Korean word.
시간부터
"시간부터" means "from (a certain) time."
In this sentence, '시간부터' indicates the starting point in time for the action of working out.
나는 아침 6시간부터 운동을 시작했다.
I started working out from 6 AM.
Here, '시간부터' specifies the beginning time of the class.
수업은 오후 2시간부터 시작될 예정입니다.
The class is scheduled to start from 2 PM.
In this example, '시간부터' denotes the starting time for the meeting.