I lost track of time

Sorry I'm late—I was deep in a report and completely lost track of time.抱歉我迟到了——我刚才全身心投入在一份报告中，完全忘了时间。

She apologised to the client, explaining that she had lost track of time during a long internal call.她向客户道歉，解释说自己在一次漫长的内部通话中忘了时间。