Vincent did not tell us.
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The question is a little vague. Oil painting as opposed to watercolors or painting in gerneral? Art, whether it's painting, dance, or music, is a form of self expression. His art was a way to show the world as he perceived it.
There is no exact answer available. It seems, though, that in the last few weeks of his life he averaged 2 paintings every 3 days!
He painted it at the asylum in St Remy. There are no records of the time it took, but we know Vincent painted very fast in his last years, so no more than a few days.
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He did not record such facts.