You hear people talking about it and worrying how long it may last. A team’s championship window can last one season or ten. It’s reliant on several factors and that window can close prematurely at any time if any of those factors suffer a loss that’s insurmountable.
Player personnel is obviously the most important factor because the players on the field most directly determine the quality of play and final outcome. They are the ones maintaining their health and availability while executing the plays they are given. Accumulating excellent and durable players on valuable contracts is paramount to keeping a team’s championship window open.