At the moment, there's no official confirmation about a season 3. But you never know - if there's enough demand and the right circumstances, it could happen.
The length of Minecraft Story Mode Season 2 can vary. On average, it might take around 8 to 10 hours to complete the main story, but if you explore everything thoroughly, it could be longer.
To buy Minecraft Story Mode Season 2, you could look on gaming platforms such as the PlayStation Store if you're a PlayStation user. Or if you have an Xbox, the Xbox Store might have it. Also, keep an eye out for any special promotions or discounts.
Well, first you need to have a good understanding of the Minecraft game mechanics and the story elements of the Story Mode. Then, you can start by collecting the necessary resources and following the specific instructions provided in the Story Mode.