When painting alla prima, the whole painting dries as one film. So providing that the paint is not diluted too much with thinner and there is enough oil content in the paint, there will be no problems. A famous Welsh artist I admire, Kyffin Williams, now deceased, always painted alla prima, but with a palette knife. He had to complete his paintings, no matter how large, in one session. Everyone has a style, or way of painting that suits them, and that's what is the most important. Enjoyment and creativity.
This little painting 4x6 ins, oil on board. Two women behind a counter discussing a topic.