Depends on what size of pot you have, what you are feeding them, what is already in the soil. I feed every second day when I water. I am using smaller pots this time around so now water and feed around 3 X per week, previously I was growing in bigger pots and watering 2 X per week.
The best thing to do is water and feed them, then wait until the pots are dry and feel the weight. then use that as a reference of when to water and feed. As I say, I feed every time I water....
good luck,
DST