My number is 5. Maybe my estimates tend to be a little optimistic :-). But in general I can look at something for a few minutes, make a quick estimate (maybe as

My number is 5. Maybe my estimates tend to be a little optimistic :-). But in general I can look at something for a few minutes, make a quick estimate (maybe ask somebody else), multiply by 5 and be pretty close to the eventual time it will take.