How soon can the oil painting be completely dried?

Generally, it takes 2-3 days to do it, that is, there is basically no trace left by hand.

But it takes a month to really dry out, that is, it can be cleaned with water and brushes.

If you want to speed up drying, you can use quick-drying oil, which is sold in art stores and is suitable for sketching when you go out. Turpentine can also be used instead of colored oil, but the color tends to be yellow.