Time is irrelevant. Sand areas down to eliminate blems, by visual. I lightly wet sand until just about all the surface is dulled by the paper and go to the next grade of paper. This leaves some work for the next grade until you can tell where it's going. The key is spending the time using your eyes and hands to find the problems while there's something that can be done about it.
Your hands can feel, more than the eye can see, from surface undulations. This is an old auto body trick.
It visual and judgement! Some jobs require a lot of work, just, to get down to realize you may have to do it over. Others, fly!
I know your probably asking for a ballpark figure, and you got some, but I find it's more important to consider comprehensive discernment rather than time. I think this is what you want!
I grab my foam block, paper, czech begining time and forget about it!
_________________ Billy Dean Thomas Covina, CA
"Multi famam, conscientiam, pauci verentur." (Many fear their reputation, few their conscience)
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