errrrrr it depends on loads of stuff. two gallon containers will prob need around 5 litres of water to fill them. nutes are all different in concentration but the ones i normally see say about 1-5ml per litre, but could be less could be more. and they come in all different sizes, so a 1litre bottle will last you around 500 litres of feeding (a guess) so thats 100 litres for eadch of your 5 autos which is about 20 waterings/feedings per pot if you use 5 litres to saturate the soil in each pot. and depending on how big they get and temperatures or the room and ventilation etc the water might evaporate out of the containers at different rates so lets just say the soil is bone dry after 3 days thats about 2-3 waterings a week so 20 divided by 2 is 10 (10 weeks of feeding/watering) and autos are around 9 weeks lifespan so this imaginary equation will last u a whole harvest. if u use soil with added nutes u wont need to give and feed till about week 4 (and this will be at 1/4 strenght anyway up to week 6 when u can go 1/2 and then to full) so this will take 4 weeks off anyway. so u will probs even have enough for two harvest mayb 3 if u go 1/4 or 1/2 strength throughout if using the enriched soil.(and many people say with autos, less nutes is best for better growth)
I just woke up so my maths is probs way off haha
