Translation:I spent too much time doing this task.
"I spent too much time on this business" must be accepted as well. No one knows if 事情is here a task or a business or anything else (even a, "thing" should be accepted) "I spent too much too time on that thing/doing that thing"..., many possibilities you did not even consider before putting all those sentences online.... It is an essential work that should have been done especially with a language like Chinese. Sirs! No wonder Birdie sounds so stupid!