Get used to picking up your pot when you water it and seeing how heavy it is and then when it's much lighter you can tell it needs watering, you'll likely find once your plant gets up there in size that you'll being watering once a day or more when you go into flower. If you have your VPD, which is temp and humidity on point that really effects your water uptake and nutrient uptake.
I would recommend watching Dr Bugbee's YouTube video Maximizing Cannabis Yields and he had a really good explanation on watering, feeding and light input. Very educational. BEST OF LUCK KEEP, THE GREEN!