Later in flower, if you start dropping lower leaves (normal for many strains) you will for sure use less water.
It is "evaporotranspiration", water being lost through transpiration of the plant leaf surface, and evaporation from the soil surface.
So these things change over time. Best bet is to develop a lift it up and guesstimate guage.
When I final plant my 1/2 gallon plant into a 5 gal pot I might water about every 6 days. Later as it fills out maybe every 3 days. Or even 2 days.
Toward end of flower water use drops again back to every 4 days or so, you just have to develop a feel for the "heft" of the pot, let it get good and dry between waterings.