How long should a full priced AAA game be?
What is the player expectation of a full priced AAA title, when it comes to play time?
We use Sergei Vasiuk’s linkedin post to help us a little data point to map the player expectation in terms of play time.

Test Phase Nomenclature & Player Expectations
The naming of your test phase can have a significant impact on the player expectation and the data you're going to gather to answer your research questions.
What is the difference between an Alpha, a Beta, or a Technical Test?
Find out here!