I am using (4) Micro Drippers per 5 gallon PotPro, what is the recommended duration and how often should I feed ?

Being that every strain/genetic, environment, medium is unique in its own way there is no one size fits all for irrigation cycles. 2-6% of your pot’s volume is a good place to start for your irrigation cycle's volume. See Crop Steering Guides under the How To Grow section of the website. Vegetative Style Steering - Mid to Late Veg and Mid Bloom. Feed start time - 1-3 hours after lights on. Shot volume - 2% (380ml) Target dryback - 10-15% Target runoff volume - 10-15% of irrigation volume Target runoff volume - 15-25% of irrigation volume When steering vegetatively you will want irrigation cycles that are 380 ml. If you are aiming for a 10% dryback overnight you will have 5 of these irrigation cycles the next day depending on the ml you water at spaced out every 20-30 minutes until runoff is achieved and then every 1-4 hours after that until 2 hours before lights out or you have a 2-3% dryback (volume may vary). In this example if you see runoff before the 5th irrigation you have not dried back far enough overnight. If you do not see runoff at this point you have dried back too far and need to add cycles later in the day, you can also adjust volumes of irrigation shots. Generative Style Steering - Early Veg, Early Bloom and Late Bloom. Feed start time - 1-3 hours after lights on Irrigation volume - 5% (950ml) Target dryback 25-35% In the early veg stage you may go 1-4 days without an irrigation event to reach target drybacks. When steering generativity you will want irrigation cycles that are 950 ml every 20-60 minutes until runoff is achieved, and then allow for a long overnight dryback. If you are aiming for a 25% overnight dryback you will have 5 of these irrigation cycles achieving runoff (irrigation volumes may vary). In this example if you see runoff before the 5th irrigation you have not dried back far enough overnight. If you do not see runoff at this point you have dried back too far and need to add irrigation cycles earlier in the day.