I use 'Ionic' series by Hydrodynamics International. Start at 25% recommended strength when there are 3 sets of true leaves, then slowly taper it up week to week from there. No one can tell you the best schedule, just have to watch the plants and respond appropriately. A EC meter is handy for keeping track of your solution. Ph is also important to monitor day to day. If your watering in soil this is obviously all different.
I am doing flood & drain, with 4" rockwool cubes inside hydroton, 2 gal pots. I watered every 3-4 days when they were younger and am now able to water 1x a day. I expect to top out at 2x a day at the end, but we'll c.