The answer to this question may vary depending on many factors, including the artist's experience level, the complexity of the case, the level of detail in the image, and more.
The experience level and professional field of the painter: The experience level and professional field of the painter will affect the speed at which they can complete the case content drawings. If the painter has relevant experience and the area of ??expertise matches the content of the case, they may be able to understand and present the content of the case more quickly.
Complexity of case content: The complexity of case content will also affect the time required to draw. More complex content may require more time and effort to understand and present.
Level of detail in the image: If the image you need to render is very detailed and precise, this may take more time and effort. Conversely, if the image doesn't require as much detail, the artist may be able to complete the job faster.
Therefore, a definite time frame cannot be given. If the case is complex and requires detailed images, it may take weeks or even months to complete. If the case is simple and the painter is experienced, a few hours or days may be enough. It is recommended to consult relevant painters or institutions for more specific time information.