You just teach whenever you have the time or feel like it.
Just know that the more you're online, the more regular students you'll have.
The advantage of teaching on an app is that you're not tied to fixed weekly schedule.
If you want to take a break for a few days or even weeks, it won't be a problem.
Show your language skills during the interview and if you're level is as good as that of a native speaker, you'll get accepted.
A little tip if you're not a native speaker: I always mention that I've been learning and speaking English since my childhood and I emphasize my ESL teaching experiences more than the fact that I'm from a country where English isn't the official language.
Double-check if you can work during their operating hours before applying!
Oh, and don't worry if you don't speak the student's language, it's not a requirement.
In this post I write an honest review about our experiences, what you need to become an online teacher and a list of companies and platforms where you can apply for jobs.You could even travel the world and earn some money without having to worry about a working visa.All you need is a laptop or a smart phone and a good internet connection.The downside was that we often had to change jobs, mostly because our visa was expiring or because it was a seasonal job.Then we had to start all over again with looking for a new place to live and work.