Of course, there are limits, but to be multitasking, one needs to use special tools like task lists. Moreover, when you have many tasks, you just need to work very quickly but, of course, also qualitatively. However, there is often a limit here because working quickly does not always mean quality.
But I think that everything comes with experience. If today you spent an hour on a task and next week it takes you only 50 minutes, that's already progress. So, as you accumulate experience, you can perform more and more tasks.