caudiciforms doesn't need much water, but it depends on several factors:
The pot's size, the amount of direct sun, the room temperature, the size
of plant and it's leaf, the humidity of the air, and of coarse the genus.
Small juvenile plants can't stand too long drought.
On the other hand; they are able to consume quite some water ,if the
light and temperature is high too. That way, you get healthier plants,
which will fight diseases and pests better, and get through the winter
See also the table
These data is bases on Denmark.
If you live closer to equator, the summers are longer.