So, it took me about a week to get hiragana properly memorised when I first started studying, and another week for katakana. I rather feel that a season a day is… excessively fast. Especially considering there’s only eight seasons, so you’d be done with all TextFugu in a week.
Keep in mind that the limiting factor here is not how fast you can read the chapters, but rather how well you can retain the information so that you can actually recall it later. If you try to move on too fast, you’ll knock everything you’ve just learnt out of your head before you can commit it to long-term storage.