This 100% depends on you! I don't think there should be any stereotypical time at all. Writers are alllll different. Do it based on your time and what you think you can handle. For instance, my current uploading is Mondays and Thursdays. This is because of multiple factors: 1. my book is very quantity over quality so while each chapter of mine is around 3,000-5,000 words, it's not my greatest work at all. 2. I already have a lot of it pre-written, so I have no issue doing two updates a week. 3. I'm getting a bit burnt out and kind of want it to be over with... 4. and the most important: it's at a rate that I am currently comfortable with and do not feel stressed.
Do not stress yourself out about writing. I spotted a reply you saying you're in high school and participate in sports. I was the same way, and I was desperate to find time to write because I've always been so passionate toward writing. Already, you're much braver than I was when I was a kid; I never shared anything I wrote to anybody. Use this time to develop your own pace and feel. Experiment, be confident, and write whenever you feel comfortable!