There is no limit to the size of the niche itself, usually in inches. The main detection limit ratio is generally 0.6 18, and there are other ratios, the size can not be determined, because the size of the Buddha statue is different, and the size of the hall is different, so it is not possible to determine one.
It is suggested that there is no problem in choosing ready-made "Buddhist niches" and ready-made comparison standards, and there is no problem in matching Buddha statues with inappropriate sizes.