https://www.vulture.com/article/severance-season-two-euphoria-season-3-why-so-long.html#:~:text=Delays%20caused%20by%20Covid%20and,between%20seasons%20has%20become%20common.

Delays caused by Covid and last summer's Hollywood strikes temporarily made things worse, but even without them, the process of making and distributing TV has become so expensive and complicated that two-year waits for fresh episodes are no longer unusual and an 18-month break between seasons has become common.