How long does a cold last? My child has been coughing for a week and half sometimes not always I can listen to her chest and you hear a wraspy sound

URI. The initial phase of a cold lasts 5-7 days. After that can be some lingering cough for a few more weeks. Unless her cough is accompanied by difficulty breathing, wheezing or high fever, it should be okay to treat her sympromatically.
The average cold. lasts about 1-2 weeks. In some cases, the cough can linger for up to 3-4 weeks. Hope this helps!