I was working on a task for last 10 days, now that I have simplified my task and talked my senior about this. I and my senior both believe that if the senior do the task he can finish it in 3-4 hours as he has experience of such thing while how much time I could take I am not sure. Shall I talk my boss about this and tell him that please let him do  this task for 4-5 hours or a day? as I have already spent more time on  this. my senior is confident that he can do it in 3-4 hours.