It's not always a conspiracy people... knee ligament sprains and strains, based on severity can get better as early as 3 weeks to as much as 8 weeks. The treatment is still just ice, non steroidal meds, rest and elevation. The answer with a sprain/strain answer is still " when the knee feels better". I don't think anybody is pulling any wool of our eyes, although it's always a possibility aka Belechick. If it's still hurting and he can't perform as well as he should it is still "day to day".