你先忙吧

I'll get out of your hair. 我不打扰你了

I'll leave you to it. 我走了，你先忙吧

I'll leave you to get/crack on. 你继续，不打扰了。

I'll let you go. 你可以去忙你的了。

I won't take any more of your time. 我不耽误你时间了。

Sorry to disturb you. Talk later. 抱歉打扰了，一会儿再说吧。