Next week I just weighed the pot again, and noted how many grammes weight lost - how much of that water was lost. I kept a record , without re-watering , week by week, which showed me that the loss reduced as the pot dried out. I then decided at what point to re=water ( 1/2 the water lost was the point I chose ). It also told me the typical proportion of water in any pot weight - at least it did after I had repeated this on half a dozen different pots.
I ended up with a tag in every pot telling me the wet weight, and the weight at which I should water again. Kitchen digital scales are very good for this.
So watering consisted of looking at the tag - “water below 250gm” for example - put it on the scales, water, or not... easy peasy, and after the initial experiments it added only moments to the watering day.
I could go on, but you get the idea ? Science, not guesswork...