Except for TV shows on TV channels, series with 20 episodes per season are not produced. In the streaming era, high-budget TV shows with 8-10 episodes are fashionable. If you want a 20-episode series, TV channels had to make it in the 2010s. Well, it is still applicable, a TV show with 15 seasons consisting of 10 episodes every year can be produced. But they do not prefer it.
Those network shows are also only 40 - 42mins long in run time.
Streaming shows can often been 50min to an hour+
so over 8 eps of the Wheel of Time for example you'd be getting the equivalent to 10 or 11 network tv episodes.