If you were concerned that the building would be obsolete for the entire Season 2, that is understandable. While that did not end up being the case, a season typically lasts for around 12 to 15 weeks these days. They used to be no more than 10 or 11 weeks but that has shifted more towards the three to four-month mark these days. Barring, of course, any extraneous issues that cause a massive season extension.