While I am a proponent of wet/dry cycling, I do not suggest waiting until leaves begin to droop or wilt. As Mr.Ito stated, this causes unnecessary stress.
Beginners should definitely rely on judging by the weight of the container, or a moisture meter… although one must test several areas in the containers to get an accurate idea of total moisture.
It is important to the growth of a healthly and strong root system to let plants dry out quite a bit between waterings. It can take several years to understand your plants and their needs enough to feel safe drying containers longer than a few days. However, with gained knowledge and a moisture meter you can easily push your girls to their limits without fear of stress.