Flu Symptoms 2024 How Long Does It Last. From two to seven days but it can be as long as a couple of weeks. If you have symptoms of long flu, including shortness of breath and a lingering cough, and they last for more than two.

More evidence points to long flu being a real phenomenon, with a large study showing symptoms persist at least 4 weeks or more after some people are. If you have symptoms of long flu, including shortness of breath and a lingering cough, and they last for more than two.