I stopped studying at 5.<br/>(Now at 6) I haven't started studying yet.<br/><br/>In the situation above<br/>Which sentence is appropriate ?<br/><br/>1.I haven't studied since 5 o'clock(for an hour).<br/>2.I haven't been studying since 5 o'clock(for an hour).<br/><br/>If possible,I'd like to express in one sentence.