Greater Manchester leaders are expecting the latest national lockdown to last longer than expected and remain skeptical about the effect it will have on rising Covid-19 cases.Mayor Andy Burnham and deputy mayor Sir Richard Leese say the success of the lockdown will depend on whether people follow the rules in the four weeks to December 2.Any benefits that arise from the lockdown are unlikely to be felt until after three weeks after it comes into place on Thursday morning, they said.Both leaders