How much should I water in coco?

I was wondering how much I should each pot? I am in 7 gallon smart pots with royal gold tupur. I have been watering 2 gallons every other day but was advised not to do that. Any watering tips at all are welcome.

You will want to water until you have maybe a gallon or so of run off. The main goal is to water enough so you can clear out all the old nutrients in the coco that will crystallize when they dry.
As far as watering schedule, I find coco will dry at much different rates depending on the temperature of the day so don't stick to every X days if you have changing temps. Also keep in mind your plant will use water at a faster rate as it gets bigger.
You can still use the "stick your finger in to the knuckle" method that they use with soil to determine the wetness of the coco. That and just pick up the pot and you will be able to feel if it needs any water. What pot are you using?

Ok I didn't see you already said you are using smart pots. You could probably use around 2 gallons of water per pot.

If the plants are small feed them 2 times a day. The bigger they get the more you will need to feed them.
It would be a good idea to get a pot tray and put underneath the plants. And go by the amount of waste you have and when the tray is dry feed them.
This is a fully automatic set up it on 3 feeds a day for one minute each feed. Each feed for a minute is about 25 litres so that 75 litres a day for the 3 feeds.
I try to aim for 15 to 20 litres of waste a week