I recently started growing aswell... most common mistake i made many many many many times was overwatering .. so my veggie stage took 3 months but i got 1 big big big bud girl still alive and almost ripe. (only 3 feet tall tought) Watering is trial and error. just stick your finger in the grow medium if you are using small herb grow "pots". Let it dry so that theres no water left but the growth medium is moist then wait a day and water it and measure the freshly watered pot. Measure it again when its completely dry to get an good pointer for "when to water".