You cannot time watering with a schedule. They tell you when to water. A baby cries. These babies wilt.
When starting in your final pot, 5 g. In your case, you should treat your autoflower like it is in a small pot when watering. Increasing water volume with growth.
I would start with no more than 250ml/1/16 g., watering directly at the base. This allows your tap root to shoot straight down, searching for water. Increase the diameter and volume of watering as she grows.
I prefer the pot lift method, apposed to the finger in soil. When the pot is light, I. Water.
Foolproof method: get a bathroom scale. Weigh an identical pot with identical medium. Use this weight as a reference.
When your pot is close to reference wheight...water. It might also help to weigh afterwatering, and each day after, so you can get an idea how much she is drinking.(a tad ocd, but it works).
I am not too familiar with happy frog but, my recollection tells me it is a hot medium for seedlings. Cutting it was good.
I use Promix/perlite. I start nutes @ 1/4 strength on day 10. If you already have some nutes in your soil, mine doesn't, I suggest backing off to at least 1/4 strength. Possibly straight water next feed. Autos are really sensitive to nutes, especially in this stage of the game.
I am not an expert by any stretch but I have researched lots and have minimal experience in comparison to alot here. I only advise when I am confident in my methods. Watering autos I am confident.