how long to rotisserie a pork roast
1 Fit the pork roast snuggly onto the rotisserie rod as dead center as possible. 2  Calculate the weight of your roast by at least 20 minutes per pound or when the internal temperature reaches 160 degrees Fahrenheit.3  Carefully remove your roast from the rotisserie, of the rod and onto a serving platter. Calculate the weight of your roast by at least 20 minutes per pound or when the internal temperature reaches 160 degrees Fahrenheit. 2  Carefully remove your roast from the rotisserie, of the rod and onto a serving platter.