I would like to know how long it would take to install 4 sheets of drywall to replace some rattly old paneling. All the wall studs are alreaday in place, it would more be a matter of taping and sanding once the drywall is in place. My dad estimated an afternoon or more for cutting, taking dow paneling, and prepping drywall for installation and 4-5 hours for sanding. Would this be accurate? Keep in mind that I would have 3 people helping including myself.