2 or 3 plants, my last grow was the same it started of extremely slow and once it started growing it was OK it was just the seedling stage and took me an incredibly long time so my veg on my last grow took me 5 and half 6 months what other people was doing in 3 months
You can test this. Divide your plants into two groups. Water and feed daily for one group, continue on with your watering strategy. You will have your answer in 2 weeks or less.